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1 And if a soul sin, and hear the voice of swearing, and is a witness, whether he hath seen or known of it; if he do not utter it, then he shall bear his iniquity. 2 Or if a soul touch any unclean thing, whether it be a carcase of an unclean beast, or a carcase of unclean cattle, or the carcase of unclean creeping things, and if it be hidden from him; he also shall be unclean, and guilty. 3 Or if he touch the uncleanness of man, whatsoever uncleanness it be that a man shall be defiled withal, and it be hid from him; when he knoweth of it, then he shall be guilty. 4 Or if a soul swear, pronouncing with his lips to do evil, or to do good, whatsoever it be that a man shall pronounce with an oath, and it be hid from him; when he knoweth of it, then he shall be guilty in one of these. 5 And it shall be, when he shall be guilty in one of these things, that he shall confess that he hath sinned in that thing: 6 And he shall bring his trespass offering unto the LORD for his sin which he hath sinned, a female from the flock, a lamb or a kid of the goats, for a sin offering; and the priest shall make an atonement for him concerning his sin. 7 And if he be not able to bring a lamb, then he shall bring for his trespass, which he hath committed, two turtledoves, or two young pigeons, unto the LORD; one for a sin offering, and the other for a burnt offering. 8 And he shall bring them unto the priest, who shall offer that which is for the sin offering first, and wring off his head from his neck, but shall not divide it asunder: 9 And he shall sprinkle of the blood of the sin offering upon the side of the altar; and the rest of the blood shall be wrung out at the bottom of the altar: it is a sin offering. 10 And he shall offer the second for a burnt offering, according to the manner: and the priest shall make an atonement for him for his sin which he hath sinned, and it shall be forgiven him. 11 But if he be not able to bring two turtledoves, or two young pigeons, then he that sinned shall bring for his offering the tenth part of an ephah of fine flour for a sin offering; he shall put no oil upon it, neither shall he put any frankincense thereon: for it is a sin offering. 12 Then shall he bring it to the priest, and the priest shall take his handful of it, even a memorial thereof, and burn it on the altar, according to the offerings made by fire unto the LORD: it is a sin offering. 13 And the priest shall make an atonement for him as touching his sin that he hath sinned in one of these, and it shall be forgiven him: and the remnant shall be the priest's, as a meat offering. 14 And the LORD spake unto Moses, saying, 15 If a soul commit a trespass, and sin through ignorance, in the holy things of the LORD; then he shall bring for his trespass unto the LORD a ram without blemish out of the flocks, with thy estimation by shekels of silver, after the shekel of the sanctuary, for a trespass offering: 16 And he shall make amends for the harm that he hath done in the holy thing, and shall add the fifth part thereto, and give it unto the priest: and the priest shall make an atonement for him with the ram of the trespass offering, and it shall be forgiven him. 17 And if a soul sin, and commit any of these things which are forbidden to be done by the commandments of the LORD; though he wist it not, yet is he guilty, and shall bear his iniquity. 18 And he shall bring a ram without blemish out of the flock, with thy estimation, for a trespass offering, unto the priest: and the priest shall make an atonement for him concerning his ignorance wherein he erred and wist it not, and it shall be forgiven him. 19 It is a trespass offering: he hath certainly trespassed against the LORD.
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[AD 430] Augustine of Hippo on Leviticus 5:1
“But if a soul should sin or hear the utterance of an oath, and he himself is a witness or sees or knows about it: if he does not make it known, he too will incur sin.” That is, “If he does not make it known, he will incur sin.” The addition of “and” is a common expression in the Scriptures. But this particular meaning, since it is obscure, seems to need an explanation. For it seems to say that a man sins when someone swears falsely in his hearing and he knows that that man is swearing falsely and remains silent. He knows this, if he was a witness to this matter about which an oath was taken, either having seen it or having known about it. That is, in some way he knows it. Either he saw it with his own eyes or the one who swears told him. For thus he could be aware of it. But between fear of this sin and fear of the treachery of men, there often arises no small temptation. For we can call someone back who is prepared to perjure himself by admonishing him or by preventing him from committing so grave a sin. If, however, he does not listen, and he swears in front of us about something that we know is false, a different question arises: should he be exposed—even if, once he is exposed, he comes into danger of death? But Scripture does not say here to whom this wrong should be made known—whether to the one to whom he swears, or to a priest or to someone who not only is unable to proceed against him by imposing a punishment but can even pray for him. It seems to me that one would free oneself even from the bond of sin if he reveals the fact to those who are able to help the perjurer rather than harm him, either by correcting him or by praying to God for him, if he himself uses the remedy of confession.

Source: QUESTIONS ON LEVITICUS 1
[AD 215] Clement of Alexandria on Leviticus 5:7
Through Moses God orders that two young birds, a pair of pigeons or of turtledoves, be offered for any sin. This means that the sinlessness of such gentle birds and their guilelessness and forgetfulness of injury is very acceptable to God. So he is instructing us to offer a sacrifice bearing the character of that against which we have offended. The plight of the poor doves, moreover, will instill into us a beginning of abhorrence for sin.

Source: CHRIST THE EDUCATOR 1.5.14
[AD 253] Origen of Alexandria on Leviticus 5:7
Not without reason are “a pair of turtledoves and two young doves” accepted in the sacrifices. For they are worth the same, and you never find separate mention of just a pair of doves but “a pair of turtledoves and two young doves.” The dove denotes the Holy Spirit. But when the great and more hidden mysteries are in question and the things that many people cannot grasp, then the Holy Spirit is represented under the appellation of a turtledove—of the bird, that is to say, that always dwells on mountain ridges and in the tops of trees. But in the valleys, in the things that all men understand, he figures as a dove.

Source: HOMILIES ON THE SONG OF SONGS 2:12