Numbers 18:13

11“This is yours, too: the wave offering of their gift, even all the wave offerings of the children of Israel. I have given them to you, and to your sons and to your daughters with you, as a portion forever. Everyone who is clean in your house shall eat of it.

12“I have given to you all the best of the oil, all the best of the vintage, and of the grain, the first fruits of them which they give to the LORD.

13The first-ripe fruits of all that is in their land, which they bring to the LORD, shall be yours. Everyone who is clean in your house shall eat of it.

14“Everything devoted in Israel shall be yours.

15Everything that opens the womb, of all flesh which they offer to the LORD, both of man and animal, shall be yours. Nevertheless, you shall surely redeem the firstborn of man, and you shall redeem the firstborn of unclean animals.