Leviticus 5:4-6

King James Version

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.