2 Chronicles 20:23

And the children of Ammon and Moab stood up against the inhabitants of mount Seir, to exterminate and destroy them; and when they had made an end of the inhabitants of Seir, they helped to destroy one another.

Judges 7:22

When they blew the three hundred trumpets, the LORD set every man's sword against his fellow and against all the army; and the army fled as far as Beth-shit'tah toward Zer'erah, as far as the border of A'bel-meho'lah, by Tabbath.

1 Samuel 14:20

And Saul and all the people that were with him were called together, and they came to the battle; and behold, every man's sword was against his fellow, a very great confusion.

Genesis 14:6

and the Horites on their mount Seir, to El-Paran, which is by the wilderness.

Genesis 36:8-9

Thus Esau dwelt in mount Seir; Esau is Edom.

Deuteronomy 2:5

attack them not; for I will not give you of their land, no, not so much as a foot-breadth; for I have given mount Seir as a possession unto Esau.

Joshua 24:4

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

Ezekiel 35:2-3

Son of man, set thy face against mount Seir, and prophesy against it,

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 on their mount Seir, to El-Paran, which is by the wilderness.
Genesis 36:8
Thus Esau dwelt in mount Seir; Esau is Edom.
Deuteronomy 2:5
attack them not; for I will not give you of their land, no, not so much as a foot-breadth; for I have given mount Seir as a possession unto Esau.
Joshua 24:4
And I gave unto Isaac Jacob and Esau; and I gave unto Esau mount Seir, to possess it; and Jacob and his sons went down into Egypt.
Ezekiel 35:2
Son of man, set thy face against mount Seir, and prophesy against it,