2 Chronicles 29:4-11, 30

He summoned the priests and Levites to meet him at the courtyard east of the Temple. He said to them, “Listen to me, you Levites! Purify yourselves, and purify the Temple of the LORD, the God of your ancestors. Remove all the defiled things from the sanctuary. Our ancestors were unfaithful and did what was evil in the sight of the LORD our God. They abandoned the LORD and his dwelling place; they turned their backs on him. They also shut the doors to the Temple’s entry room, and they snuffed out the lamps. They stopped burning incense and presenting burnt offerings at the sanctuary of the God of Israel. “That is why the LORD’s anger has fallen upon Judah and Jerusalem. He has made them an object of dread, horror, and ridicule, as you can see with your own eyes. Because of this, our fathers have been killed in battle, and our sons and daughters and wives have been captured. But now I will make a covenant with the LORD, the God of Israel, so that his fierce anger will turn away from us. My sons, do not neglect your duties any longer! The LORD has chosen you to stand in his presence, to minister to him, and to lead the people in worship and present offerings to him.”

King Hezekiah and the officials ordered the Levites to praise the LORD with the psalms written by David and by Asaph the seer. So they offered joyous praise and bowed down in worship.