Numbers 18:16-22 NIRV

16 When they are a month old, you must buy them back. You must pay the price to buy them back. The price is set at two ounces of silver. It must be weighed out in keeping with the standard weights that are used in the sacred tent.

17 "But you must not buy back any male calf that is born first. And you must not buy back any male sheep or goat that is born first. They are holy. Sprinkle their blood on the altar. And burn their fat as an offering that is made with fire. It gives a smell that is pleasant to me.

18 "The meat will belong to you. It is just like the breast and the right thigh of the wave offering. Those parts belong to you.

19 Part of the holy offerings the people of Israel bring to me will be set to one side. No matter what it is, I will give it to you and your sons and daughters. It is your regular share. It is a covenant of salt from me. The salt means that the covenant will last for all time to come for you and your children."

20 The Lord spoke to Aaron. He said, "You will not receive any part of the land I am giving to Israel. You will not have any share among them. I am your share. I am what you will receive among the people of Israel.

21 "The people of Israel will give me a tenth of everything they produce. And I will give it to the Levites. They serve at the Tent of Meeting. I will give them the tenth for the work they do there.

22 From now on the people of Israel must not go near the Tent of Meeting. If they do, they will be punished for their sin. They will die.