Deuteronomy 18:8

They shall have like portions to eat, as much as those who were on duty by selection, beside that which cometh of the sale of his patrimony, that is, regardless of the income he may have from the sale of goods inherited from his father. The meadow-land belonging to the Levites could not be sold, but they had the right either to sell or to rent a house belonging to them. The precept of the New Testament which corresponds to this order is that which establishes the rule that "they which preach the Gospel should live of the Gospel. "