But the Jewish Israel bathes daily, because he is daily being defiled: and, for fear that defilement should be practised among us also, therefore was the definition touching the one bathing made.
The Lord responded to him, because he said hand and head: The one who has washed does not need to wash again, except to wash only the feet (Ibid., 10). Why is this? Because in baptism all sin is washed away. Therefore, sin is removed: but because Adam was deceived by the devil (Gen. III, 6), and poison was poured upon his feet, you wash the feet; so that in the part where the serpent laid its ambush, a greater assistance of sanctification may be added, so that it cannot deceive you thereafter. Therefore, wash your feet, so that you may wash away the poison of the serpent. It also leads to humility, so that we may not be ashamed in the mystery of that which we scorn in service.
(Hom. lxx. 2) Though Peter was the first of the Apostles, yet it is possible that the traitor petulantly placed himself above him; and that this may be the reason, why our Lord first began to wash, and then cometh to Peter.
(Hom. lxx. 2) Some one will ask why none of them prevented Him, except Peter, this being a sign not of want of love, but of reverence. The reason seems to be, that He washed the traitor first, and came next to Peter, and that the other disciples were checked by the reply to Peter. Any of the rest would have said what Peter did, had his turn come first.
(Hom. lxx. 2) i. e. How useful a lesson of humility it teaches thee, and how directly this virtue leads to God.
(Hom. lxx. 2) He does not say on what account He performs this act of washing, but only threatens him. For Peter was not persuaded by the first answer: Thou shalt know hereafter: he did not say, Teach me then that I may submit. But when he was threatened with separation from Christ, then he submitted.
(Hom. lxx. 2) Or thus: When He calls them clean, you must not suppose that they were delivered from sin before the victim was offered. He means cleanness in respect of knowledge; for they were now delivered from Jewish error.
"Then cometh He to Simon Peter and Peter saith unto Him, Lord, dost Thou wash my feet?"
"With those hands," he saith, "with which Thou hast opened eyes, and cleansed lepers, and raised the dead?" For this (question) is very emphatic; wherefore He needed not to have said any more than the, "Thou"; for even of itself this would have sufficed to convey the whole. Some one might reasonably enquire, how none of the others forbade Him, but Peter only, which was a mark of no slight love and reverence. What then is the cause? He seemeth to me to have washed the traitor first, then to have come to Peter, and that the others were afterwards instructed from his case. That He washed some one other before him is clear from its saying, "But when He came to Peter." Yet the Evangelist is not a vehement accuser, for the "began," is the expression of one implying this. And even if Peter were the first, yet it is probable that the traitor, being a forward person, had reclined even before the chief. For by another circumstance also his forwardness is shown, when He dippeth with his Master in the dish, and being convicted, feels no compunction; while Peter being rebuked but once on a former occasion, and for words which he spake from loving affection, was so abashed, that being even distressed and trembling, he begged another to ask a question. But Judas, though continually convicted, felt not.
"He saith unto him, What I do thou knowest not now, but thou shall know here after."
That is "thou shall know how great is the gain from this, the profit of the lesson, and how it is able to guide us into all humblemindedness." What then doth Peter? He still hinders Him, and saith, "Thou shall never wash my feet." "What doest thou, Peter? Rememberest thou not those former words? Saidst thou not, 'Be merciful to Thyself,' and heardest thou not in return, 'Get thee behind Me, Satan'? Art thou not even so sobered, but art thou yet vehement?" "Yea," he saith, "for what is being done is a great matter, and full of amazement." Since then he did this from exceeding love, Christ in turn subdueth him by the same; and as there He effected this by sharply rebuking him, and saying, "Thou art an offense unto Me," so here also by saying, "If I wash thee not, thou hast no part with Me."
What then saith that hot and burning one? "Lord, not my feet only, but also my hands and my head."
Vehement in deprecation, he becometh yet more vehement in acquiescence; but both from love. For why said He not wherefore He did this, instead of adding a threat? Because Peter would not have been persuaded. For had He said, "Suffer it, for by this I persuade you to be humbleminded," Peter would have promised it ten thousand times, in order that his Master might not do this thing. But now what saith He? He speaketh of that which Peter most feared and dreaded, the being separated from Him; for it is he who continually asks, "Whither goest Thou?" Wherefore also he said, "I will give even my life for Thee." And if, after hearing, "What I do thou knowest not now, but thou shalt know hereafter," he still persisted, much more would he have done so had he learnt (the meaning of the action). Therefore said He, "but thou shalt know hereafter," as being aware, that should he learn it immediately he would still resist. And Peter said not, "Tell me, that I may suffer Thee," but (which was much more vehement) he did not even endure to learn, but withstands Him, saying, "Thou shalt never wash my feet." But as soon as He threatened, he straightway relaxed his tone. But what meaneth, "Thou shalt know after this"? "After this?" When? "When in My Name thou shall have cast out devils; when thou shalt have seen Me taken up into Heaven, when thou shalt have learnt from the Spirit that I sit on His right hand, then shall thou understand what is being done now."
"He that is washed, needeth not save to wash his feet, but is clean every whit; and ye are clean, but not all. For He knew who should betray Him."
"And if they are clean, why washeth He their feet?" That we may learn to be modest. On which account He came not to any other part of the body, but to that which is considered more dishonorable than the rest. But what is, "He that is washed"? It is instead of, "he that is clean." Were they then clean, who had not yet been delivered from their sins, nor deemed worthy of the Spirit, since sin still had the mastery, the handwriting of the curse still remaining, the victim not having yet been offered? How then calleth He them "clean"? That thou mayest not deem them clean, as delivered from their sins, He addeth, Behold, "ye are clean through the word that I have spoken unto you." That is, "In this way ye are so far clean; ye have received the light, ye have been freed from Jewish error. For the Prophet also saith, 'Wash you, make you clean, put away the wickedness from your souls'; so that such a one is washed and is clean." Since then these men had cast away all wickedness from their souls, and had companied with Him with a pure mind, therefore He saith according to the word of the Prophet, "he that is washed is clean already." For in that place also It meaneth not the "washing" of water, practiced by the Jews; but the cleansing of the conscience.
Simon did not want his teacher to wash his feet. The purpose of our Lord’s action was … to teach you that you should deeply love and eagerly help one another. Peter did not know that that was the purpose of his action. So again our Lord said to him who was still resisting, “Unless I wash you, you have no share with me.” Since from these words Peter believed that this washing of the feet was in place of baptism, and that from it he would have obtained his share with the Lord and therefore might say that he was entirely washed—if this was the present situation, the Lord corrected his ignorance by saying, “One who has bathed does not need to wash, except for the feet, but is entirely clean. And you are clean, but not all of you.” Then the Evangelist by explaining the words of our Lord added, “For he knew who was to betray him. For this reason he said, ‘Not all of you are clean.’ ” By speaking to Simon our Lord means to say: “This is not the baptism for the remission of sins. You have already received it once and do not need it twice, because you were made clean by the first you received. Now it is necessary that only your feet are washed, and soon you will know the purpose of this act.” Certainly the disciples received the baptism of remission from John, in which the teaching of our Lord confirmed them even more by exhorting them to virtue. And then the descended Spirit perfected them when it later came on them.
(Tr. lvi. 4) Clean all except the feet. The whole of a man is washed in baptism, not excepting his feet; but living in the world afterwards, we tread upon the earth. Those human affections then, without which we cannot live in this world, are, as it were, our feet, which connect us with human things, so that if we say we have no sin, we deceive ourselves. (1 John 1:8) But if we confess our sins, He who washed the disciples' feet, forgives us our sins even down to our feet, wherewith we hold our converse with earth.
(Ad. Seleuc. Ep. c. viii.) From what is here said, we understand that Peter was already baptized. Indeed that He baptized by His disciples, shows that His disciples must have been baptized, either with John's baptism, or, which is more probable, Christ's. He baptized by means of baptized servants; for He did not refuse the ministry of baptizing, Who had the humility to wash feet.
(Tr. lvi. 4) Or, the disciples when washed had only to have their feet washed; because while man lives in this world, he contracts himself with earth, by means of his human affections, which are as it were his feet.
"He that is washed needeth not save to wash his feet, but is clean every whit." It may seem perhaps to certain ones that the Lord really intended to say that what needed washing was only the feet; that as those were clean who already had been washed, their hands and head had no need to be washed, and only their feet, wherewith they trod on the ground. But if we accept this explanation, Peter ought to have received Him; for those who are baptized with Christian baptism, are understood to be washed every whit, their hands and head included; and yet, without doubt, they ought afterwards to have their feet washed. But while it is by no means unfitting for such a meaning as this to be given to it by us, the deeper one, which I think ought principally to be attended to, is this: that the Lord said, "He that is washed needeth not save to wash his feet," because a man has, of course, his feet washed in baptism as part of his whole body; but afterwards, as man must needs live in this world, he treads on the ground with his human affections, so that it may be said that his feet are defiled thereby; and thus it is, that in the Lord's prayer we say, "Forgive us our debts, as we also forgive our debtors." For the sins that are remitted to us in baptism, if we have committed any, no longer hurt us in any way; and yet, because they were before remitted, we ought still to pray in the same way, and to say, "Forgive us our debts." For a man, though baptized, in living this mortal life, passes not his time without sin. Hence, though regeneration has already cleansed the whole of man, yet as man must needs live in this world, he treads on the ground with his human affections, so that his feet become defiled.
Therefore, what ought we to understand, brethren, but that in holy baptism a man has all of him washed, not all save his feet, but every whit? and yet, while thereafter living in this human state, he treads on the ground. And thus our human feelings themselves, without which we cannot live in this mortal state, are, as it were, our feet, wherewith we are brought into sensible contact with human affairs; and are so in such a way, that if we say we have no sin, we deceive ourselves, and the truth is not in us. And every day, therefore, is He who intercedeth for us, washing our feet: and that we, too, have daily need to be washing our feet, that is, ordering aright the path of our spiritual footsteps, we acknowledge even in the Lord's prayer, when we say, "Forgive us our debts, as we also forgive our debtors."
He draws His illustration from a common incident of ordinary human life, and opportunely contrives the rebuke to the traitor, teaching the man both to repent of his purpose and to change himself to a better mind. For even if Christ's reproaches do not yet convict him of his meditated treachery, yet the saying must carry with it a stern significance. For in testifying to the perfect cleanness of some [but not all] of the disciples, He thereby makes the one who was not clean feel an uneasy suspicion, and points out the presence of a polluted one. For Christ graciously commends the cleanness of His other disciples, as shown by their willing joy in attending on Him continually, the hardship they underwent in following Him, their firmness in faith, and their fulness of love towards Him. On Judas, however, the reproach of his insatiable covetousness and the feebleness of his affection for our Lord Jesus the Christ are branding the ineffaceable stain, and steeping him in the pollution, of his incomparably hideous treachery. When therefore Christ says: Now ye are clean, but not all, though the language is obscure, yet it conveys a profitable rebuke to the traitor. For although He did not speak plainly, as we have just said, still in each man's heart conscience was sitting in judgment, pricking the sinner to the heart, and bringing home to the guilty one the force of the words according to their necessary meaning.
And notice how fully the conduct of Christ is expressive of a certain set purpose and of God-befitting forbearance. For if He had said plainly who it was that would betray Him, He would have made the other disciples to be at enmity with the traitor. Judas might thence perhaps have suffered some fatal mischief, and have undergone a premature penalty at the hands of one who was spurred on by pious zeal to prevent the murder of his Master by previously putting to death His would-be betrayer. Therefore, by merely giving an obscure hint, and then leaving the conviction to gnaw its way to the conscience, He proved incontestably the greatness of His inherent forbearance. For although He well, knew that Judas had no kindly feeling or wise consideration for His Master, but that he was full of the poison of devilish bitterness and even then devising the means whereby he might effect the betrayal, He honoured him in the same measure as the rest, and washed even his feet also, continually exhibiting the marks of His own love, and not letting loose His anger till He had tried every kind of remonstrance. For thou mayest perceive how this special characteristic also is peculiar to the Divine Nature. For although God knows what is about to happen, He brings His punishment prematurely on no man: but rather, after bearing with the guilty for the utmost length of needful time, when He sees them in no way profiting thereby, but rather remaining in their self-chosen evil ways, then at length He punishes them; showing it to be the actual result of their perverse folly, and not really an effect of His own counsel or of His will. For instance, Ezekiel on this account says: As I live, saith the Lord, I desire not the death of him that dieth, but rather that he should turn from his evil way and live. Therefore with long-suffering and forbearance our Lord Jesus the Christ still treats the traitor just as He does His other disciples, although the devil had already put into his heart to betray Him, (for this also the Evangelist was constrained to point out at the outset of the narrative;) and washes his feet, thus making his impious conduct absolutely inexcusable, so that his apostasy might be seen to be the fruit of the wickedness which was in him.
Jesus is giving clear notice that this washing of the feet indicates pardoning of sins, and not only that which is given once in baptism but in addition that by which the daily guilty actions of the faithful that everyone lives with in this life are cleansed by his daily grace. Our feet, by which we move about [and] touch the ground—and for this reason we cannot keep them free from contact with dirt, as we can the rest of our bodies—signify the necessity of our living on earth, by which we who are idle and negligent are daily affected to a great extent. Even outstanding people who live the highest kind of life are distracted from the heavenly contemplation that they love so much, so that “if we say we have no sin, we deceive ourselves and the truth is not in us.” …The person who has been cleansed in the baptismal font and has received pardon for all his sins has no need to be cleansed again. Moreover, he cannot be cleansed again in the same way. He finds it necessary only to have the daily defilements of his worldly life wiped away by the daily forgiveness of his Redeemer. His whole body, together with its actions, is clean, with the exception merely of those things that cling to the mind because of the necessities of temporal cares. For their daily polluting and cleansing we say daily in prayer, “And forgive us our debts as we also forgive our debtors.”
[AD 220] Tertullian on John 13:10