2 Chronicles 29:24-26

King James Version

²⁴ And the priests killed them, and they made reconciliation with their blood upon the altar, to make an atonement for all Israel: for the king commanded that the burnt offering and the sin offering should be made for all Israel.

²⁵ And he set the Levites in the house of the Lord 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 so was the commandment of the Lord by his prophets.

²⁶ And the Levites stood with the instruments of David, and the priests with the trumpets.