Numbers 16:5, 8-10

Then he said to Korah and his followers, “Tomorrow morning the LORD will show us who belongs to him and who is holy. The LORD will allow only those whom he selects to enter his own presence.

Then Moses spoke again to Korah: “Now listen, you Levites! Does it seem insignificant to you that the God of Israel has chosen you from among all the community of Israel to be near him so you can serve in the LORD’s Tabernacle and stand before the people to minister to them? Korah, he has already given this special ministry to you and your fellow Levites. Are you now demanding the priesthood as well?