2 Chronicles 5:11-12

11Then the priests came out of the Holy Place. All the different groups of priests who were there had made themselves clean to serve God.

12The Levites who were musicians stood on the east side of the altar. They were Asaph, Heman, Jeduthun and their sons and their relatives. They wore clothes made of linen. They made music with cymbals, harps and lyres. There were also 120 priests who made music with trumpets.