Numbers 18:12-15

12All the best of the oil, and all the best of the vintage, and of the grain, the first-fruits of them which they give unto Jehovah, to thee have I given them. 13The first-ripe fruits of all that is in their land, which they bring unto Jehovah, shall be thine; every one that is clean in thy house shall eat thereof. 14Everything devoted in Israel shall be thine. 15Everything that openeth the womb, of all flesh which they offer unto Jehovah, both of man and beast shall be thine: nevertheless the first-born of man shalt thou surely redeem, and the firstling of unclean beasts shalt thou redeem.