2 Chronicles 20:10-12, 22-23

“And now it’s happened: men from Ammon, Moab, and Mount Seir have shown up. You didn’t let Israel touch them when we got here at first—we detoured around them and didn’t lay a hand on them. And now they’ve come to kick us out of the country you gave us. O dear God, won’t you take care of them? We’re helpless before this vandal horde ready to attack us. We don’t know what to do; we’re looking to you.”

As soon as they started shouting and praising, GOD set ambushes against the men of Ammon, Moab, and Mount Seir as they were attacking Judah, and they all ended up dead. The Ammonites and Moabites mistakenly attacked those from Mount Seir and massacred them. Then, further confused, they went at each other, and all ended up killed.