Leviticus 7:34-36

34For the breast of the wave-offering, and the shoulder of the heave-offering, have I taken of the children of Israel from the sacrifices of their peace-offerings, and have given them unto Aaron the priest and unto his sons from the children of Israel by an everlasting statute.

35This is [the portion] of the anointing of Aaron and of the anointing of his sons, from Jehovah's offerings by fire, in the day [when] he presented them to serve Jehovah as priests,

36which Jehovah commanded to be given them by the children of Israel in the day that he anointed them: [it is] an everlasting statute, throughout their generations.