Leviticus 7:34-36

34The ribs and the top part of the right leg are gifts. They are from the friendship offering. God wants Aaron and his sons to have them. People must give these parts of their gift to the priests.

35The Lord gave this part of the Israelites' offerings to Aaron's sons. He gave it to them on the day when they became the Lord's priests.

36The Lord told the Israelites that they must do this. He told them that on the day that Aaron's sons became priests. All their sons and grandsons must always give these offerings to the priests.” ’