2 Chronicles 25:5-13

Then Amaziah organized the army, assigning generals and captains for all Judah and Benjamin. He took a census and found that he had an army of 300,000 select troops, twenty years old and older, all trained in the use of spear and shield. He also paid about 7,500 pounds of silver to hire 100,000 experienced fighting men from Israel. But a man of God came to him and said, “Your Majesty, do not hire troops from Israel, for the LORD is not with Israel. He will not help those people of Ephraim! If you let them go with your troops into battle, you will be defeated by the enemy no matter how well you fight. God will overthrow you, for he has the power to help you or to trip you up.” Amaziah asked the man of God, “But what about all that silver I paid to hire the army of Israel?” The man of God replied, “The LORD is able to give you much more than this!” So Amaziah discharged the hired troops and sent them back to Ephraim. This made them very angry with Judah, and they returned home in a great rage. Then Amaziah summoned his courage and led his army to the Valley of Salt, where they killed 10,000 Edomite troops from Seir. They 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. Meanwhile, 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.