Numbers 18:23-27 Catholic Public Domain Version (CPDV)

23. Only the sons of Levi may serve me in the tabernacle and may carry the sins of the people. It shall be an everlasting ordinance in your generations. They shall possess nothing else;

24. being content with the oblation of tithes, which I have separated for their uses and necessities."

25. And the Lord spoke to Moses, saying:

26. "Instruct the Levites, and also declare to them: When you will receive, from the sons of Israel, the tithes, which I have given to you, offer their first-fruits to the Lord, that is, the tenth part of a tenth,

27. so that it may be accounted to you as an oblation of the first-fruits, as much from the threshing floors as from the oil and wine presses.

Numbers 18