With this hope, then, let us attach ourselves to the one who is faithful to promises and just in judgments. The one who bids us to refrain from lying is all the less likely to lie. For nothing is impossible to God, save lying.
Through Moses God gave commandments about sacrifices, and the whole book of Leviticus is taken up with acceptable ways for them to be carried out. The Lord, through the prophets, found fault with those who contemptuously misstated these things, calling them disobedient to the commandment. He told them, “I have not asked you to do these things!… Neither did I speak to your fathers about sacrifices, nor give them commands about whole burnt offerings.”Some have put forth the opinion that either the Scriptures do not agree or that God, who gave the commandment, is a liar. But in this there can be no disagreement—far from it. The Father, who is truth, cannot lie, “for it is impossible for God to lie,” as Paul affirms. Actually, these things are plain to those who accept the writings of the law with faith and look at them in the right way. Here is my explanation, and may God grant by your prayers that I am not too far from the truth. It does not appear to me that God gave the commandments and the law concerning sacrifices right away when he led them out of Egypt. Nor did he who gave the law really pay any attention to the whole burnt offerings, as such. He was looking ahead to those things that were prefigured and pointed out by them. “For the law has but a shadow of the good things to come.” And “Those regulations were set forth until the time of reformation.”9
That is why the whole law did not deal with sacrifices, although it did include commands concerning them. By means of these commands it began to teach people, calling them away from idols and drawing them to God, giving them proper teaching for the times in which they lived. So you see, God did not give the people those commands about sacrifices and offerings when he brought them out of Egypt, nor even when they first came to Mount Sinai. God is not like people, that he should want those things for himself. No, he gave the commandment so that they might know him and his Word (the Son)—and forget about those so-called gods that do not really exist but appear to do so because of the show people put on.
“Through this” oath “God desired to show more convincingly to the heirs of the promise” that God’s promise, because indeed it is God’s, will never be changed. God’s oath was infallible in its being interposed, that is, between God, the angel and Abraham.
“Through two unchangeable things” … the former is that he swore by himself. The latter is that David said, “The Lord has sworn and will not change his mind, that you are a priest forever after the order of Melchizedek.” It is by this means that we who have been made coheirs of his promise “might have strong encouragement.” We “have fled for refuge” in order to protect ourselves, not for God’s justice, in order that God may draw and drive us away from the evils of this world, and may open for us the way “into the inner shrine behind the curtain.” We do not go in first. We do not go into the shrine of the tabernacle, where Moses went, but into the inner shrine in heaven, “where Jesus has gone as a forerunner, having become a high priest forever,” not in order to offer the victims of sacrifices, like Aaron, but to offer the word for all nations, like Melchizedek.
Having boldly reflected on the faults of the Hebrews, and sufficiently alarmed them, he consoles them, first, by praises, and secondly (which also is the stronger ground), by the thought that they would certainly attain the object of their hope. Moreover he draws his consolation, not from things future, but again from the past, which indeed would the rather persuade them. For as in the case of punishment, he alarms them rather by those things future, so also in the case of the prizes set before them, he encourages them by these things past, showing herein God's way of dealing. And that is, not to bring in what has been promised immediately, but after a long time. And this He does, both to present the greatest proof of His power, and also to lead us to Faith, that they who are living in tribulation without having received the promises, or the rewards, may not faint under their troubles.
And omitting all the rest, though he had many whom he might have mentioned, he brought forward Abraham both on account of the dignity of his person, and because this had occurred in a special way in his case.
And yet at the end of the Epistle he says, that "all these, having seen the promises afar off, and having embraced them, received them not, that they without us should not be made perfect." "For when God made promise to Abraham" (he says) "because He could swear by no greater, He sware by Himself, saying, Surely blessing I will bless thee, and multiplying I will multiply thee. And so after he had patiently endured, he obtained the promise." How then does he say at the end of the Epistle that "he received not the promises," and here, that "after he had patiently endured he obtained the promise"? How did he not receive? How did he obtain? He is not speaking of the same things in this place and in the other, but makes the consolation twofold. God made promises to Abraham, and after a long space of time He gave the things spoken of in this place, but those others not yet.
"And so after he had patiently endured, he obtained the promise." Seest thou that the promise alone did not effect the whole, but the patient waiting as well? Here he alarms them, showing that oftentimes a promise is thwarted through faintheartedness. And this he had indeed shown through the instance of the Jewish people: for since they were faint-hearted, therefore they obtained not the promise. But now he shows the contrary by means of Abraham. Afterwards near the end of the Epistle he proves something more also: that even though they had patiently endured, they did not obtain; and yet not even so are they grieved.
When he said above, “the full assurance of the hope,” he made clear that God furnished to Abraham “full assurance,” not that which belonged to his conduct through works but that which belonged to him through God’s redemptive plan.
Paul added that “Christ” has become “an eternal high priest” for us, in that Christ leads all those believing through him in each generation to God based on the hope of the resurrection.
As God has no one superior to him (he is saying), his oath was witness; he swore by himself, in fact. Yet though making a promise and doing it with an oath, he did not immediately fulfill the promise; instead, the patriarch needed great patience, and only with the passage of a great length of time did he thus see the realization of the promise.
He is a high priest forever, not in offering sacrifices (having offered his own body once), but in being a mediator leading the believers to the Father; through him (he says, remember) we both have had access to the Father. The Lord himself says in the sacred Gospels, “No one comes to the Father except through me.” We must be aware, of course, that the divine apostle made mention of the oaths sworn to Abraham so that the unchanging character of the divine will should be brought out; it endures in advance the stability of high priesthood according to the order of Melchizedek, the oath being linked to the word at this place.
Of those who through faith inherited the promises, many have died, but they were kept safe for others; he only remembers Abraham, both because of the dignity of his person and because he especially was deemed worthy and attained the promises. And through this, he shows that one should not be faint-hearted, but should wait for God, having the habit not to hastily bring about the promised things, but through a long time.
“He swore by Himself.” When did God swear by himself? In those very words, in which he says, "By myself I have sworn." (Gen. 22:16) Perhaps also the word "Amen" could be considered a divine oath; for "Amen," truly "Amen," signifies nothing else but a confirmation of the truth; and what else could truth be but God? Therefore, when you see Christ saying, "Amen, amen, I say to you," understand that he swears by having no one greater than himself, and the "Amen" is an oath, just as the Father also swears. Yet some have thought that the Son swears to Abraham; for the Word swears, "Amen, I will bless you." For Scripture says that the angel spoke to Abraham. But nowhere do they say that the Father is an angel, but the Son is the angel of the great counsel.
"And so, having patiently." You see that the patience of Abraham accomplished something? He said that by being patient he obtained the promise, in order to show the great power of patience, and that it was not the promise alone that accomplished everything; but also patience.
"he attained the promise." And yet in the end, it says that all these, having seen them from afar and embraced them, did not receive the promises, so that they would not be made perfect apart from us. How then does he say here, "he attained the promise?" And we say, he did not speak about the same things. For the things here he has given to him, concerning which he now spoke, but those there, he keeps, concerning which he says at the end of the Epistle, "And the end of all their opposition." (Heb. 12:3) And the end of all opposition and dispute to confirm the things spoken by him is the oath. Both, however, the obtaining and the not yet obtaining, serve as encouragement to the faint-hearted; the one, that we also, if we endure patiently, will obtain; the other, that, since he has not yet obtained it, though perfected many years ago, we who are still struggling are not foolish because we have not yet obtained it.
“an end of all dispute.” And the conclusion of all contradiction and dispute to confirm what is said is the oath. For indeed many things are spoken and disputed on each side; but the oath, coming last and confirming, resolves all doubts.
Since there were many who inherited the promises by faith, he has for now passed over all the rest, leaving them for later, and recalls only Abraham, both because of the importance of his person, and especially because he both was deemed worthy of and received the promise. And by this he also shows that one must not give in to faintheartedness, but hope in God, Who customarily does not fulfill a promise quickly, but after a long time. And when did God "swear by Himself"? Either in the very words in which He says: "I have sworn by Myself." Or perhaps someone might say that in the word "truly" is contained God's oath by Himself; for "truly" means "in truth." This is nothing other than an affirmation of truth; but who can truth be other than God? So too the Lord in the Gospel, saying: "Truly, truly, I say to you" (e.g., John 6 and others), swears with this very same oath; He swears by Himself, just as the Father does, since He has no one higher by whom to swear. However, some have thought that the Son Himself was the one then conversing with Abraham; for Scripture says: "the Angel said to Abraham" (Gen. 18). But in no way, they say, could the Father be an Angel, but the Son is the Angel of great counsel.
[AD 99] Clement of Rome on Hebrews 6:13-20