Leviticus 5:4-6

MKJV(i) 4 Or if a soul swears, pronouncing with his lips to do evil or to do good, whatever it is that a man speaks rashly with an oath, and it is hidden from him, and he knows, then he shall be guilty of one of these. 5 And it shall be when he is guilty in one of these, he shall confess that in which he has sinned. 6 And he shall bring his trespass offering to Jehovah for his sin which he has sinned, a female from the flock, a lamb or a doe of the goats, for a sin offering. And the priest shall make an atonement for him for his sin.