Numbers 18:12-18

12I will give to you the best olive oil, the best wine and the best grain. The people give to the Lord the first part of these that they get.

13I also give to you the best parts of the food that people bring to the Lord. Any clean person who lives in your house may eat them.

14Everything in Israel that should belong to me is now yours.

15I give to you every firstborn animal and male child that people offer to the Lord. But you must pay the price for every firstborn son and for every firstborn male animal that is not clean.

16When they are one month old, you must buy them from me for five shekels of silver each. The shekel must have the same weight as the shekel that the Levites use in God's Holy Tent. There are 20 gerahs in one shekel.

17You must not pay for the firstborn of a cow, a sheep or a goat. Those animals are holy. Splash the blood from those animals on the altar and burn the fat from them. The smell will make the Lord happy.

18And the meat of those animals belongs to you. In the same way, the meat of the ribs and the right back leg of the special gifts that you lift up to me also belong to you.