The ark of God was brought into Jerusalem. It was put in the tent David had set up for it. The priests brought burnt offerings and friendship offerings to God.
He appointed some of the Levites to serve in front of the ark of the Lord. David wanted them to pray, give thanks and praise the Lord. He is the God of Israel.
Asaph was the leader of those Levites. Zechariah was next. Then came Jeiel, Shemiramoth, Jehiel, Mattithiah, Eliab, Benaiah, Obed-Edom and Jeiel. They played the lyres and harps. Asaph played the cymbals.
Cry out, "Save us, God our Savior. Save us. Bring us back from among the nations. Then we will give thanks to you, because your name is holy. We will celebrate by praising you."
David left Asaph and his helpers to serve in front of the ark of the covenant of the Lord. They served there at regular times. They did it as they were required to do each day.
David left them there to sacrifice burnt offerings to the Lord on the altar every morning and evening. They did it in keeping with everything that is written in the Law of the Lord. That's the Law he had given to Israel.
Heman and Jeduthun were with the priests. So were the rest of those who had been chosen by name and appointed to serve. They had been chosen to give thanks to the Lord, "because his faithful love continues forever."
It was the duty of Heman and Jeduthun to blow the trumpets. They also had the duty of playing the cymbals and other instruments for the sacred songs. The sons of Jeduthun were stationed at one of the gates.