Moses
Numbers 18:21ESV·traditional attribution

“To the Levites I have given every tithe in Israel for an inheritance, in return for their service that they do, their service in the tent of meeting,

Matthew Henry Presbyterian @wholebiblehenry

Here is a further account of the provision that was made both for the Levites and for the priests, out of the country. I. They must have no inheritance in the land; only cities to dwell in were afterwards allowed them, but no ground to occupy: Thou shalt not have any part among them, Num 18:20.

Commenting on Numbers 18:20-32

John Gill Reformed Baptist @doctorgill

Neither must the children of Israel henceforth come nigh the tabernacle of the congregation,.... To do any part of the priest's office, as to burn incense, as Korah and his company had done; or to do any part of the work of the Levites, by watching in the tabernacle, by taking it down and setting it up, and bearing the vessels of it; otherwise they...

Jamieson-Fausset-Brown Reformed @jfbcommentary

THE LEVITES' PORTION. (Num 18:21-32) I have given the children of Levi all the tenth in Israel for an inheritance, for their service which they serve--Neither the priests nor the Levites were to possess any allotments of land but to depend entirely upon Him who liberally provided for them out of His own portion; and this law was subservient to many important purposes--such as that...

Commenting on Numbers 18:21-32