Now these, the singers, the heads of fathers’ houses of the Levites, were in the chambers of the temple free from other service, for they were on duty day and night.
and they were singing a new song before the throne and before the four living creatures and before the elders. No one could learn that song except the 144,000 who had been redeemed from the earth.
And Hezekiah appointed the divisions of the priests and of the Levites, division by division, each according to his service, the priests and the Levites, for burnt offerings and peace offerings, to minister in the gates of the camp of the Lord and to give thanks and praise.
Their duty was also to assist with the showbread, the flour for the grain offering, the wafers of unleavened bread, the baked offering, the offering mixed with oil, and all measures of quantity or size.
and whenever burnt offerings were offered to the Lord on Sabbaths, new moons, and feast days, according to the number required of them, regularly before the Lord.