Leviticus 5:5-6

5So it shall be when he becomes guilty in one of these, that he shall 1confess that in which he has sinned. 6He shall also bring his guilt offering to the Lord for his sin which he has 2committed, 3a female from the flock, a lamb or a 4goat as a sin offering. So the priest shall make atonement on his behalf for his sin.