2 Chronicles 35:15 References

15 The singers, the sons of Asaph, were also at their stations aaccording to the command of David, Asaph, Heman, and Jeduthun the king's seer; and bthe gatekeepers at each gate did not have to depart from their service, because the Levites their brethren prepared for them.

a 1 Chronicles 25:1

1 Chronicles 25

1 Moreover, David and the commanders of the army set apart for the service some of the sons of aAsaph and of Heman and of Jeduthun, who were to bprophesy with lyres, charps and cymbals; and the number of those who performed their service was:

Other references for 2 Chronicles 35:15

b 1 Chronicles 26:12-19