1 Chronicles 16:37

Overview - 1 Chronicles 16
David's festival sacrifice.
He orders a choir to sing thanksgiving.
The psalm of thanksgiving.
37 He appoints ministers, porters, priests, and musicians, to attend continually on the ark.
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1 Chronicles 16:37  (King James Version)
So he left there before the ark of the covenant of the LORD Asaph and his brethren, to minister before the ark continually, as every day's work required:

before the ark
4-6 ; 15:17-24 25:1-6

as every
2 Chronicles 8:14 ; Ezra 3:4