21 And he gave counsel to the people, and he ordained the singers of the Lord, that they should praise him in their companies, and that they should go before the host, and say with according voice, Acknowledge ye to the Lord, for he is good; for his mercy is without end.

22 And when they began to sing praisings, the Lord turned the ambush-ments of them against themselves, that is, of the sons of Ammon, and of Moab, and of the hill of Seir, which went out to fight against Judah; and they were slain.