2 Chronicles 35:15

And the sons of Asaph, the makers of melody, were in their places, as ordered by David and Asaph and Heman and Jeduthun, the king's seer; and the door-keepers were stationed at every door: there was no need for them to go away from their places, for their brothers the Levites made ready for them.

1 Chronicles 9:17-19

And the door-keepers: Shallum and Akkub and Talmon and Ahiman and their brothers: Shallum was the chief.

1 Chronicles 25:1-7

Further, David and the chiefs of the servants of the holy place made selection of certain of the sons of Asaph and of Heman and of Jeduthun for the work of prophets, to make melody with corded instruments and brass; and the number of the men for the work they had to do was:

1 Chronicles 26:12-19

Of these were the divisions of the door-keepers, men of authority, having responsible positions like their brothers to be servants in the house of the Lord.

1 Chronicles 16:41-42

And with them Heman and Jeduthun, and the rest who were marked out by name to give praise to the Lord, for his mercy is unchanging for ever;

1 Chronicles 23:5

Four thousand were door-keepers; and four thousand gave praise to the Lord with the instruments which I made, said David, for giving praise.

2 Chronicles 29:25-26

Then he put the Levites in their places in the house of the Lord, with brass and corded instruments of music as ordered by David and Gad, the king's seer, and Nathan the prophet: for the order was the Lord's, given by his prophets.

Psalm 77:1

I was crying to God with my voice; even to God with my voice, and he gave ear to me.

Psalm 78:1

Give ear, O my people, to my law; let your ears be bent down to the words of my mouth.

Psalm 79:1

O God, the nations have come into your heritage; they have made your holy Temple unclean; they have made Jerusalem a mass of broken walls.

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 door-keepers: Shallum and Akkub and Talmon and Ahiman and their brothers: Shallum was the chief.
1 Chronicles 26:14
And the care of the door on the east came out for Shelemiah. Then the name of Zechariah his son, a man wise in discussion, came out, and the door on the north was given to him.

Basic English, produced by Mr C. K. Ogden of the Orthological Institute - public domain