The Ammonites and Moabites rose up against the inhabitants of Mount Seir, devoting them to destruction. And when they had made an end to the inhabitants of Seir, they helped to destroy one another.

Judges 7:22
And when the three hundred rams' horns sounded, the LORD set all the men in the camp against one another with their swords. The army fled to Beth-shittah toward Zererah as far as the border of Abel-meholah near Tabbath.

1 Samuel 14:20
Then Saul and all his troops assembled and marched to the battle, and they found the Philistines in total confusion, with each man wielding the sword against his neighbor.

2 Chronicles 20:24
When the men of Judah came to a place overlooking the wilderness, they looked for the vast army, but there were only corpses lying on the ground; no one had escaped.

2 Chronicles 21:8
In the days of Jehoram, Edom rebelled against the hand of Judah and appointed their own king.

Isaiah 19:2
"So I will incite Egyptian against Egyptian; brother will fight against brother, neighbor against neighbor, city against city, and kingdom against kingdom.

Ezekiel 38:21
And I will summon a sword against Gog on all My mountains, declares the Lord GOD, and every man's sword will be against his brother.

Haggai 2:22
I will overturn royal thrones and destroy the power of the kingdoms of the nations. I will overturn chariots and their riders; horses and their riders will fall, each by the sword of his brother.

For the children of Ammon and Moab stood up against the inhabitants of mount Seir, utterly to slay and destroy them: and when they had made an end of the inhabitants of Seir, every one helped to destroy another.