2 Chronicles 20:21

Then he consulted with the people, and appointed the musicians, and them who sing praises, to give thanks and to sing the holy songs of praise. So marching at the head of the army, they sung the hymn, O praise the Lord, for his mercy endureth forever.

And he took counsel with the people, and set appointed men to sing psalms and praises, to give thanks, and sing the holy songs of praise in going forth before the host: and they said, Give thanks to the Lord, for his mercy endures for ever.