Leviticus 5:18-19

MKJV(i) 18 then he shall bring a ram without blemish out of the flock, at your evaluation, for a trespass offering, to the priest. And the priest shall make an atonement for him for his ignorance in which he erred without knowing it, and it shall be forgiven him. 19 It is a trespass offering. He has certainly trespassed against Jehovah.