1 Chronicles

And he set the Levites in the house of the Lord with cymbals, with psalteries, and with harps, according to the commandment of David, and of Gad the king’s seer, and Nathan the prophet: for so was the commandment of the Lord by his prophets.

As well the singers as the players on instruments shall be there: all my springs are in thee.

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

And the Levites, of the children of the Kohathites, and of the children of the Korhites, stood up to praise the Lord God of Israel with a loud voice on high.

From thirty years old and upward even until fifty years old, all that enter into the host, to do the work in the tabernacle of the congregation.