Diḇre haYamim Bĕt (2 Chronicles) 29:25

And he appointed the Lĕwites in the House of יהוה with cymbals, with harps, and with lyres, according to the command of Dawiḏ, and of Gaḏ, seer of the sovereign, and of Nathan the prophet, for the command was by the hand of יהוה, by the hand of His prophets.