2 Chronicles 25:11-14

11Then Amaziah summoned his courage and led his army to the Valley of Salt, where they killed 10,000 Edomite troops from Seir.

12They captured another 10,000 and took them to the top of a cliff and threw them off, dashing them to pieces on the rocks below.

13Meanwhile, the hired troops that Amaziah had sent home raided several of the towns of Judah between Samaria and Beth-horon. They killed 3,000 people and carried off great quantities of plunder.

14When King Amaziah returned from slaughtering the Edomites, he brought with him idols taken from the people of Seir. He set them up as his own gods, bowed down in front of them, and offered sacrifices to them!