The people of Israel will always give Aaron and his sons these parts. Those parts will always belong to the priests when the people of Israel make an offering to the Lord. When they give these parts to the priest, it will be the same as giving them to the Lord.
That is part of the offerings that were burned on the fire for the Lord. And the law I gave you teaches that a part belongs to you and your sons. But you must eat it in a holy place.