And the priest shall make atonement before the LORD on behalf of the person who erred by sinning unintentionally; and when atonement has been made for him, he will be forgiven.

Leviticus 4:2
"Tell the Israelites to do as follows with one who sins unintentionally against any of the LORD's commandments and does what is forbidden by them:

Leviticus 4:20
He shall offer this bull just as he did the bull for the sin offering; in this way the priest will make atonement on their behalf, and they will be forgiven.

Leviticus 4:35
And he shall remove all the fat, just as the fat of the lamb is removed from the peace offerings, and he shall burn it on the altar along with the offerings made by fire to the LORD. In this way the priest will make atonement for him for the sin he has committed, and he will be forgiven.

Leviticus 14:18
The rest of the oil in his palm, the priest is to put on the head of the one to be cleansed, to make atonement for him before the LORD.

Numbers 15:29
You shall have the same law for the one who acts in error, whether he is a native-born Israelite or a foreigner residing among you.

And the priest shall make an atonement for the soul that sins ignorantly, when he sins by ignorance before the LORD, to make an atonement for him; and it shall be forgiven him.