It is to belong to Aaron and his sons as their due share forever from Bnei-Yisrael, because it is a contribution. It is to be a contribution from Bnei-Yisrael from their sacrifices of fellowship offerings, their contribution to Adonai.
You are to eat it in a holy place, because it is your portion and your sons’ portion of the offerings of Adonai made by fire. For so I have been commanded.