1 Chronicles 16:37

So he left there, before the ark of the covenant of LORD, Asaph and his brothers, to minister before the ark continually, as every day's work required,

2 Chronicles 8:14

And he appointed, according to the ordinance of David his father, the divisions of the priests to their service, and the Levites to their offices, to praise, and to minister before the priests, as the duty of every day required, al

Ezra 3:4

And they kept the feast of tabernacles as it is written, and [offered] the daily burnt-offerings by number according to the ordinance, as the duty of every day required.

1 Chronicles 15:17-24

So the Levites appointed Heman the son of Joel. And of his brothers, Asaph the son of Berechiah. And of the sons of Merari their brothers, Ethan the son of Kushaiah.

1 Chronicles 16:4-6

And he appointed certain of the Levites to minister before the ark of LORD, and to celebrate and to thank and praise LORD, the God of Israel:

1 Chronicles 25:1-6

Moreover David and the captains of the army set apart for the service certain of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with psalteries, and with cymbals. And the number of those who did t

Treasury of Scripture Knowledge

Summary

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:

Bible References

Before the ark

1 Chronicles 16:4
And he appointed certain of the Levites to minister before the ark of LORD, and to celebrate and to thank and praise LORD, the God of Israel:
1 Chronicles 15:17
So the Levites appointed Heman the son of Joel. And of his brothers, Asaph the son of Berechiah. And of the sons of Merari their brothers, Ethan the son of Kushaiah.
1 Chronicles 25:1
Moreover David and the captains of the army set apart for the service certain of the sons of Asaph, and of Heman, and of Jeduthun, who should prophesy with harps, with psalteries, and with cymbals. And the number of those who did t

As every

2 Chronicles 8:14
And he appointed, according to the ordinance of David his father, the divisions of the priests to their service, and the Levites to their offices, to praise, and to minister before the priests, as the duty of every day required, al
Ezra 3:4
And they kept the feast of tabernacles as it is written, and [offered] the daily burnt-offerings by number according to the ordinance, as the duty of every day required.