Numbers 18:20

17 But the firstling of a cow, or the firstling of a sheep, or the firstling of a goat, thou shalt not redeem; they [are] holy: thou shalt sprinkle their blood upon the altar, and shalt burn their fat [for] an offering made by fire, for a sweet savor to the LORD.

18 And the flesh of them shall be thine, as the wave-breast and as the right shoulder are thine

19 All the heave-offerings of the holy things, which the children of Israel offer to the LORD, have I given to thee, and to thy sons and thy daughters with thee, by a statute for ever: it [is] a covenant of salt for ever before the LORD to thee and to thy seed with thee.

20 And the LORD spoke to Aaron, Thou shalt have no inheritance in their land, neither shalt thou have any part among them: I [am] thy part and thy inheritance among the children of Israel.

21 And behold, I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve, [even] the service of the tabernacle of the congregation.

22 Neither must the children of Israel henceforth come nigh the tabernacle of the congregation, lest they bear sin, and die.

23 But the Levites shall do the service of the tabernacle of the congregation, and they shall bear their iniquity: [It shall be] a statute for ever throughout your generations, that among the children of Israel they have no inheritance.