Deuteronomy 18
1 Ref The priests, the Levites, that is, all the tribe of Levi, will have no part or heritage with Israel: their food and their heritage will be the offerings of the Lord made by fire.
2 Ref And they will have no heritage among their countrymen: the Lord is their heritage, as he has said to them.
3 Ref And this is to be the priests' right: those who make an offering of a sheep or an ox are to give to the priest the top part of the leg and the two sides of the head and the stomach.
4 Ref And in addition you are to give him the first of your grain and wine and oil, and the first wool cut from your sheep.
5 Ref For he, and his sons after him for ever, have been marked out by the Lord your God from all your tribes, to do the work of priests in the name of the Lord.