Numbers 18:14
Everything in Israel, which has been dedicated to me, shall be yours.
All the first harvest of their land, which they bring to the Lord, shall be yours. Every clean person in your house may eat them.
All the best of the oil, all the best of the wine and wheat, the firstfruits given by them to the Lord, these I give to you.
To you also shall belong all the firstfruits set aside and offered by the Israelites; this I give to you and your sons and daughters forever. Every person in your house who is clean may eat it.
You may eat these most holy things. Every male may eat them. You are to consider them sacred.
This shall be yours of the most holy things, of the consecrated food. Every offering that the Israelites give back to me, whether it be a grain offering, a sacrifice for sin, or a sacrifice of repayment, is most holy; it shall belong to you and your sons.
Tributes to Priests The Lord said to Aaron: “I myself have given you all that is set aside for me, from every offering of the people of Israel. I will give it to you and your sons as you share forever.
But you and your sons will undertake the priestly duties concerning the altar and all the sacred things behind the veil. You will perform the worship services, the duties of which I entrust to your priesthood. But the layman who comes near shall die.”
I myself have chosen your relatives, the Levites, from among the Israelites as a gift to you. They will belong to the Lord to serve at the Tent of Meeting.
You yourselves must take charge of the Sanctuary and the altar, and my anger will never again fall on the Israelites.