Numbers 18:18-19

And the flesh of them shall be thine, as the wave-breast and as the right thigh, it shall be thine. All the heave-offerings of the holy things, which the children of Israel offer unto Jehovah, have I given thee, and thy sons and thy daughters with thee, as a portion for ever: it is a covenant of salt for ever before Jehovah unto thee and to thy seed with thee.