Numbers 15:25, 28

And the priest shall make atonement for all the congregation of the people of Israel, and they shall be forgiven, because it was a mistake, and they have brought their offering, a food offering to the LORD, and their sin offering before the LORD for their mistake.

And the priest shall make atonement before the LORD for the person who makes a mistake, when he sins unintentionally, to make atonement for him, and he shall be forgiven.