2 Chronicles 20:23

And the sons of Ammon and Moab rose 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, each one helped his companion to kill himself.

Judges 7:22

But the three hundred blew the shofarot, and the LORD set each man's sword against his fellow, even throughout all the camp; and the host fled to Bethshittah in Zererath and to the border of Abelmeholah unto Tabbath.

1 Samuel 14:20

And Saul and all the people that were with him assembled themselves, and they came to the battle; and, behold, each man's sword was against his fellow, and there was a very great discomfiture.

Genesis 14:6

and the Horites in their Mount Seir unto the plain of Paran, which is by the wilderness.

Genesis 36:8-9

Thus dwelt Esau in Mount Seir; Esau is Edom.

Deuteronomy 2:5

do not seek a fight with them; for I will not give you of their land, no, not so much as a foot breadth because I have given Mount Seir unto Esau for an inheritance.

Joshua 24:4

And to Isaac I gave Jacob and Esau, and to Esau I gave Mount Seir to possess it; but Jacob and his sons went down into Egypt.

Ezekiel 35:2-3

Son of man, set thy face against Mount Seir, and prophesy against him,

Treasury of Scripture Knowledge

Summary

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.

Bible References

Mount seir

Genesis 14:6
and the Horites in their Mount Seir unto the plain of Paran, which is by the wilderness.
Genesis 36:8
Thus dwelt Esau in Mount Seir; Esau is Edom.
Deuteronomy 2:5
do not seek a fight with them; for I will not give you of their land, no, not so much as a foot breadth because I have given Mount Seir unto Esau for an inheritance.
Joshua 24:4
And to Isaac I gave Jacob and Esau, and to Esau I gave Mount Seir to possess it; but Jacob and his sons went down into Egypt.
Ezekiel 35:2
Son of man, set thy face against Mount Seir, and prophesy against him,