2 Chronicles 35:15

And those singing, sons of Asaph, upon their station according to the command of David, and Asaph, and Heman, and Jeduthun the kings seer; and the porters at gate and gate; not for them to depart from their service; for their brethren the Levites prepared for them.

1 Chronicles 9:17-19

The gate-keepers, Shallum and Akkub, and Talmon, and Ahiman, and their brethren: Shallum the head;

1 Chronicles 25:1-7

And David will separate, and the chiefs of the army, for service to the sons of Asaph and Heman and Jeduthun, prophesying with harps, with lyres and with cymbals: and there will be their number of men of work for their service.

1 Chronicles 26:12-19

To these the divisions of the gates for the heads of the strong ones, the watches near their brethren, to serve in the house of Jehovah.

1 Chronicles 16:41-42

And with them Heman and Jeduthun, and the rest being chosen, who were separated by names to confess to Jehovah: for his mercy is forever.

1 Chronicles 23:5

And four thousand gate keepers, and four thousand praising to Jehovah with instruments which I made to praise.

2 Chronicles 29:25-26

And he will set up the Levites in the house of Jehovah with cymbals, with lyres and with harps by the command of David, and Gad, the king's seer, and Nathan the prophet: for by the hand of Jehovah the command by the hand of his prophets.

Psalm 77:1

To the overseer for Jeduthun: to Asaph a chanting. My voice to God, and I will cry with my voice to God, and he gave ear to me.

Psalm 78:1

Instruction to Asaph. Give ear, O my people, to my law: incline your ears to the sayings of my mouth.

Psalm 79:1

Chanting to Asaph. O God, the nations came into thine inheritance; they defiled thy holy temple; they set Jerusalem for 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 gate-keepers, Shallum and Akkub, and Talmon, and Ahiman, and their brethren: Shallum the head;
1 Chronicles 26:14
And the lot will fall from the sunrising to Shelemiah. And Zechariah his son counseling in understanding, they cast lots; and his lot will go forth north.