Numbers 16:9-10
16:9 Does it seem too small a thing to you that the God of Israel has separated you from the community of Israel to bring you near to himself, to perform the service of the tabernacle of the Lord, and to stand before the community to minister to them?
16:10 He has brought you near and all your brothers, the sons of Levi, with you. Do you now seek the priesthood also?