2 Chronicles 29:15-30

They gathered their brothers (fellow Levites) together, consecrated themselves, and went in to cleanse the house of the LORD, as the king had commanded by the words of the LORD. The priests went into the inner part of the house of the LORD to cleanse it, and every unclean thing they found in the temple of the LORD they brought out to the courtyard of the LORD’S house. Then the Levites received it to take out to the Kidron Valley [for disposal]. Now they began the consecration on the first [day] of the first month, and on the eighth day of the month they came to the porch of the LORD. Then for eight days they consecrated the house of the LORD, and on the sixteenth day of the first month they finished. Then they went inside to King Hezekiah and said, “We have cleansed the entire house (temple) of the LORD, the altar of burnt offering with all of its utensils, and the table of showbread with all its utensils. Moreover, we have prepared and consecrated all the utensils which King Ahaz had discarded during his reign in his unfaithfulness; and behold, they are in front of the altar of the LORD.” Then King Hezekiah arose early and assembled the officials of the city, and went up to the house of the LORD. They brought seven bulls, seven rams, seven lambs, and seven male goats for a sin offering for the kingdom, the sanctuary, and Judah. He commanded the priests, the sons of Aaron, to offer them on the altar of the LORD. So they slaughtered the bulls, and the priests took the blood and sprinkled it on the altar. They also slaughtered the rams and sprinkled the blood on the altar; then they slaughtered the lambs and sprinkled the blood on the altar. Then they brought the male goats for the sin offering before the king and the assembly, and they laid their hands on them [to symbolize the transference of their sin]. The priests slaughtered them and cleansed the altar from sin with their blood to atone for all Israel, because the king commanded that the burnt offering and the sin offering be made for all Israel. Hezekiah stationed the Levites in the house of the LORD with cymbals, with harps, and with lyres, in accordance with the command of David [his ancestor] and of Gad the king’s seer, and of Nathan the prophet; for the command was from the LORD through His prophets. The Levites stood with the musical instruments of David, and the priests with the trumpets. Then Hezekiah gave the order to offer the burnt offering on the altar. And when the burnt offering began, the song to the LORD also began with the trumpets accompanied by the instruments of David, king of Israel. The entire congregation worshiped, the singers also sang, and the trumpets sounded; all this continued until the burnt offering was finished. When the burnt offerings were completed, the king and all who were present with him bowed down and worshiped [God]. Also King Hezekiah and the officials ordered the Levites to exclaim praises to the LORD with the words of David and of Asaph the seer. And they exclaimed praises with joy, and bowed down and worshiped.