Numbers 16:9

“Thus you shall separate the Levites from among the sons of Israel, and the Levites shall be Mine.

and what He did to Dathan and Abiram, the sons of Eliab, the son of Reuben, when the earth opened its mouth and swallowed them, their households, their tents, and every living thing that followed them, among all Israel—

‘Is it too slight a thing for you that you should be shepherded in the good pasture, that you must tread down with your feet the rest of your pastures? Or that you should drink of the clear waters, that you must foul the rest with your feet?

“Yet they shall be ministers in My sanctuary, having oversight at the gates of the house and ministering in the house; they shall slaughter the burnt offering and the sacrifice for the people, and they shall stand before them to minister to them.