2 Chronicles 29:26

And the Levites stood with the instruments of David, and the priests with the trumpets.

The verse belongs to the account of Hezekiah reopening the temple after it had been cleansed and its vessels prepared for worship, restoring the work of the temple and the worship of Jehovah. That restoration was a reviving of the ancient worship, bringing the priests and Levites back to service in the temple.

At that reopening service the Levites stood in their appointed places with the instruments of David and the priests stood with trumpets. The Levites took their places with the instruments used in David's worship arrangements while the priests stood with trumpets, as the temple worship was restored. The Levites played the instruments associated with David and the priests played trumpets as part of the worship accompanying the offerings in the restored temple worship.

Hezekiah began to reign at twenty-five years old after a season of great decline in temporal affairs and in morals, following the bad influence left upon the people by his father Ahaz and his grandfather Jotham. Having been given a pious mould through the influence of his mother, he immediately set about the restoration. His work of re-establishing true worship came when he was only twenty-five and the son of a bad father, and it required ability and determination because evil beliefs and practices were strong even though the people were dissatisfied under his father and grandfather. His reform came after Judah had fallen into idolatry, and his course in cleansing the house of God and putting away idolatry pleased God because it was done for God's glory.

He opened the temple and cleared it of the accumulated rubbish of years, and sent messengers with letters from city to city through the northern kingdom inviting all to forsake idols and return to God for a great festival at Jerusalem. He held a great fourteen-day Passover with many sacrifices and great gladness that was the greatest revival since Solomon. Afterward, under his direction the people broke down idols, cut down groves, and destroyed high places and altars. The verse thus fits the example of a king taking the initiative in a national religious revival, since his revival included restoring worship at the temple with Levites playing instruments associated with David and priests sounding trumpets.