1 Chronicles 16:37

37 David left Asaph and his associates before the ark of the covenant of the LORD to minister there regularly, according to each day’s requirements.

Read 1 Chronicles 16:37 Using Other Translations

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:
So David left Asaph and his brothers there before the ark of the covenant of the LORD to minister regularly before the ark as each day required,
David arranged for Asaph and his fellow Levites to serve regularly before the Ark of the LORD ’s Covenant, doing whatever needed to be done each day.