TSK · Numbers 5:7

And it shall be, when he shall be guilty in one of these [things], that he shall confess that wherein he hath sinned:

and he shall make restitution for that which he hath done amiss in the holy thing, and shall add the fifth part thereto, and give it unto the priest; and the priest shall make atonement for him with the ram of the trespass-offering, and he shall be forgiven.

or any thing about which he hath sworn falsely; he shall even restore it in full, and shall add the fifth part more thereto: unto him to whom it appertaineth shall he give it, in the day of his being found guilty.

And they shall confess their iniquity, and the iniquity of their fathers, in their trespass which they trespassed against me, and also that, because they walked contrary unto me,

He singeth before men, and saith, I have sinned, and perverted that which was right, And it profited me not:

He that covereth his transgressions shall not prosper: But whoso confesseth and forsaketh them shall obtain mercy.

If we say that we have no sin, we deceive ourselves, and the truth is not in us.