Numbers 18:23-24

²³Only the descendants of Levi are permitted to work at the Sacred Tent, and they will be punished if anything bad happens to it. That is a law that will never be changed. You descendants of Levi will not receive any land among the other Israeli people,

²⁴because I will give you one tenth of all the crops and animals that the Israelis bring to be offerings to me. That is why I said that you will not receive any land like the other Israelis will receive.”