Numbers 18:10-19

10All the men in your family may eat these gifts. Remember that they are holy gifts.

11Also, you will receive part of the special gifts that the Israelites lift up in front of me. I have given it to you and to your sons and daughters, for all time. Every person who lives in your house may eat it. But they must be clean at the time.

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.

19I have given all the gifts that the Israelites offer to the Lord to you, your sons and your daughters. That is a rule for all time. That is the Lord's special promise to you and to your descendants for all time.’