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Judah Invaded
22When they began singing and praising, the Lord set ambushes against the sons of Ammon, Moab, and Mount Seir, who had come against Judah; so they were struck down. 23For the sons of Ammon and Moab rose up against the inhabitants of Mount Seir, completely destroying them; and when they had finished with the inhabitants of Seir, they helped to destroy one another.
2 Chronicles 20:22-23 (NASB)