1 Chronicles 16:40-42

40Their job was to offer burnt offerings as sacrifices to the Lord on the big altar there. They did that every morning and every evening, as the law of the Lord commanded. The Israelites had to obey that law.

41Heman and Jeduthun were with them at the tabernacle in Gibeon. There were also other Levites that David had chosen to help them. Their special job was to give thanks to the Lord with songs, because his faithful love continues for ever.

42Heman and Jeduthun also had authority for the trumpets, the cymbals and the other musical instruments. The musicians used them to praise God with their music. Jeduthun's sons stood as guards at the entrance of the tabernacle.