2 Chronicles 25:11-15

Now Amaziah gathered his courage and led his people out, and went to the Valley of Salt, and struck and killed ten thousand of the sons of Seir.

The sons of Judah also captured ten thousand alive and brought them to the top of the cliff, and threw them down from the top of the cliff so that they were all dashed to pieces.

But the troops whom Amaziah sent back, those not going with him to battle, raided the cities of Judah from Samaria to Beth-horon, and struck and killed three thousand of them, and plundered a large amount of spoils. Amaziah Rebuked for Idolatry

Now after Amaziah came from slaughtering the Edomites, he brought the gods of the sons of Seir and set them up as his gods. Then he bowed down before them and burned incense to them.

So the anger of the Lord burned against Amaziah, and He sent him a prophet who said to him, “Why have you sought the gods of the people who have not saved their own people from your hand?”