Numbers 16:9
9 is it too small a thing for you that the God of Israel has nseparated you from the congregation of Israel, to bring you near to himself, to do service in the tabernacle of the Lord and to stand before the congregation to ominister to them,
Deuteronomy 10:8
8 hAt that time the Lord set apart the tribe of Levi to carry the ark of the covenant of the Lord to stand before the Lord to minister to him and to ibless in his name, to this day.
1 Chronicles 23:13
13 The sons of Amram: Aaron and Moses. mAaron was set apart to dedicate the most holy things, that he and his sons forever should make offerings before the Lord and minister to him and npronounce blessings in his name forever.