2 Chronicles 35:15

The singers, the sons of Asaph, were also in their places in accordance with the command of David, Asaph, Heman, and Jeduthun the king’s seer; and the gatekeepers at each gate did not need to leave their service, because their kinsmen the Levites prepared for them.

1 Chronicles 9:17-19

The gatekeepers were: Shallum, Akkub, Talmon, Ahiman, and their relatives (Shallum the chief

1 Chronicles 25:1-7

Moreover, David and the commanders of the army selected for the [temple] service some of the sons of Asaph, Heman, and Jeduthun, who were to prophesy with lyres, harps, and cymbals. The list of the musicians who performed their service was as follows:

1 Chronicles 26:12-19

To these divisions of the gatekeepers, the chief men, were given duties, like their relatives, to minister in the house of the Lord.

1 Chronicles 16:41-42

With them were Heman and Jeduthun, and the rest who were chosen and designated by name, to give thanks to the Lord, for His lovingkindness endures forever.

1 Chronicles 23:5

and 4,000 were gatekeepers, and 4,000 [musicians] were to praise the Lord with the instruments which David made for giving praise.

2 Chronicles 29:25-26

Hezekiah stationed the Levites in the house of the Lord with cymbals, with harps, and with lyres, in accordance with the command of David [his ancestor] and of Gad the king’s seer, and of Nathan the prophet; for the command was from the Lord through His prophets.

Psalm 77:1

My voice rises to God, and I will cry aloud;
My voice rises to God, and He will hear me.

Psalm 78:1

Listen, O my people, to my teaching;
Incline your ears to the words of my mouth [and be willing to learn].

Psalm 79:1

O God, the nations have invaded [the land of Your people] Your inheritance;
They have defiled Your sacred temple;
They have laid Jerusalem in ruins.

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
The gatekeepers were: Shallum, Akkub, Talmon, Ahiman, and their relatives (Shallum the chief
1 Chronicles 26:14
The lot for the east [gates] fell to Shelemiah. They cast lots also for his son Zechariah, a wise counselor, and his lot came out for the north [gates].