Leviticus 5:5-6

5‘And it shall be, when he is guilty in any of these matters, that he shall confess that he has sinned in that thing;

6and he shall bring his trespass offering to the Lord for his sin which he has committed, a female from the flock, a lamb or a kid of the goats as a sin offering. So the priest shall make atonement for him concerning his sin.