Numbers 15:28

The priest must then make atonement before the Lord on behalf of the person who acts in error sinning unintentionally, and when he makes atonement for him, he will be forgiven.

Leviticus 4:35

He is to remove all its fat just as the fat of the lamb is removed from the fellowship sacrifice. The priest will burn it on the altar along with the fire offerings to the Lord. In this way the priest will make atonement on his behalf for the sin he has committed, and he will be forgiven.

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