Numbers 15:28

The priest shall make atonement before the Lord for the person who commits an error when he sins unintentionally, making atonement for him so that he may be forgiven.

Leviticus 4:35

Then he shall remove all its fat, just as the fat of the lamb is removed from the sacrifice of the peace offerings, and the priest shall offer it up in smoke on the altar, on the offerings by fire to the Lord. In this way the priest shall make atonement for him in regard to the sin which he has committed, and he will be forgiven.

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