Leviticus 5:18-19

Amplified Bible

¹⁸ He is then to bring to the priest a ram without blemish from the flock, according to your valuation, for a guilt offering. In this way the priest shall make atonement for him regarding the error which he committed unintentionally and did not know it, and he shall be forgiven. ¹⁹ It is a guilt offering; he was certainly guilty before the Lord.”