2 Chronicles 35:15

And the singers the sons of Asaph were in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king's seer; and the porters were at every gate: they needed not to depart from their service; for their brethren the Levites prepared for them.

1 Chronicles 9:17-19

And the porters: Shallum, and Akkub, and Talmon, and Ahiman, and their brethren (Shallum was the chief),

1 Chronicles 25:1-7

Moreover David and the captains of the host 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 them that did the work according to their service was:

1 Chronicles 26:12-19

Of these were the courses of the doorkeepers, even of the chief men, having offices like their brethren, to minister in the house of Jehovah.

1 Chronicles 16:41-42

and with them Heman and Jeduthun, and the rest that were chosen, who were mentioned by name, to give thanks to Jehovah, because his lovingkindness endureth for ever;

1 Chronicles 23:5

and four thousand were doorkeepers; and four thousand praised Jehovah with the instruments which I made,'said David , to praise therewith.

2 Chronicles 29:25-26

And he set the Levites in the house of Jehovah with cymbals, with psalteries, and with harps, according to the commandment of David, and of Gad the king's seer, and Nathan the prophet; for the commandment was of Jehovah by his prophets.

Psalm 77:1

I will cry unto God with my voice, Even unto God with my voice; and he will give ear unto me.

Psalm 78:1

Give ear, O my people, to my law: Incline your ears to the words of my mouth.

Psalm 79:1

O God, the nations are come into thine inheritance; Thy holy temple have they defiled; They have laid Jerusalem in heaps.

Treasury of Scripture Knowledge

Summary

And the singers the sons of Asaph were in their place, according to the commandment of David, and Asaph, and Heman, and Jeduthun the king's seer; and the porters waited at every gate; they might not depart from their service; for their brethren the Levites prepared for them.

Bible References

The porters

1 Chronicles 9:17
And the porters: Shallum, and Akkub, and Talmon, and Ahiman, and their brethren (Shallum was the chief),
1 Chronicles 26:14
And the lot eastward fell to Shelemiah. Then for Zechariah his son, a discreet counsellor, they cast lots; and his lot came out northward.

American Standard Version Public Domain