Numbers 4:15
15 And when Aaron and his sons have finished covering the sanctuary and all the furnishings of the sanctuary, kas the camp sets out, after that the sons of Kohath shall come to carry these, but they must not touch the holy things, lest they ldie. These are the things of the tent of meeting that the sons of Kohath are to carry.
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.