2 Chronicles 29:20-24
20-24Then Hezekiah the king went to work: He got all the leaders of the city together and marched to The Temple of God. They brought with them seven bulls, seven rams, seven lambs, and seven he-goats to sacrifice as an Absolution-Offering for the royal family, for the Sanctuary, and for Judah as a whole; he directed the Aaronite priests to sacrifice them on the Altar of God. The priests butchered the bulls and then took the blood and sprinkled it on the Altar, and then the same with the rams and lambs. Finally they brought the goats up; the king and congregation laid their hands upon them. The priests butchered them and made an Absolution-Offering with their blood at the Altar to atone for the sin of all Israel—the king had ordered that the Whole-Burnt-Offering and the Absolution-Offering be for all Israel.
25-26The king ordered the Levites to take their places in The Temple of God with their musical instruments—cymbals, harps, zithers—following the original instructions of David, Gad the king's seer, and Nathan the prophet; this was God's command conveyed by his prophets. The Levites formed the orchestra of David, while the priests took up the trumpets.