Exodus 29:28
28 It shall be for Aaron and his sons as a jperpetual due from the people of Israel, for it is a gcontribution. It shall be a gcontribution from the people of Israel from their peace offerings, their contribution to the Lord.
Numbers 18:18–19
18 But their flesh shall be yours, as vthe breast that is waved and as the right thigh are yours. 19 wAll the holy contributions that the people of Israel present to the Lord I give to you, and to your sons and daughters with you, as a perpetual due. xIt is a covenant of salt forever before the Lord for you and for your offspring with you.”