Numbers 18:12-15

12“I give you all the finest olive oil and all the finest new wine and grain they give the Lord as the firstfruits of their harvest.

13All the land’s firstfruits that they bring to the Lord will be yours. Everyone in your household who is ceremonially clean may eat it.

14“Everything in Israel that is devoted to the Lord is yours.

15The first offspring of every womb, both human and animal, that is offered to the Lord is yours. But you must redeem every firstborn son and every firstborn male of unclean animals.