2 Chronicles 20:21-23

New Revised Standard Version, Anglicised

²¹ When he had taken counsel with the people, he appointed those who were to sing to the Lord and praise him in holy splendour, as they went before the army, saying,

²² As they began to sing and praise, the Lord set an ambush against the Ammonites, Moab, and Mount Seir, who had come against Judah, so that they were routed. ²³ For the Ammonites and Moab attacked the inhabitants of Mount Seir, destroying them utterly; and when they had made an end of the inhabitants of Seir, they all helped to destroy one another.