1 Chronicles 15:2

15:2 Then David said, “Only the Levites may carry the ark of God, for the Lord chose them to carry the ark of the Lord and to serve before him perpetually.

1 Chronicles 16:37

David Appoints Worship Leaders

16:37 David left Asaph and his colleagues there before the ark of the Lord’s covenant to serve before the ark regularly and fulfill each day’s requirements,

1 Chronicles 21:3

21:3 Joab replied, “May the Lord make his army a hundred times larger! My master, O king, do not all of them serve my master? Why does my master want to do this? Why bring judgment on Israel?”

1 Chronicles 23:13

23:13 The sons of Amram:

Aaron and Moses.

Aaron and his descendants were chosen on a permanent basis to consecrate the most holy items, to offer sacrifices before the Lord, to serve him, and to praise his name.

1 Chronicles 23:31

23:31 and whenever burnt sacrifices were offered to the Lord on the Sabbath and at new moon festivals and assemblies. A designated number were to serve before the Lord regularly in accordance with regulations.