2 Chronicles 20:23

to destroy them utterly and to wipe them out. And when they had made an end of the inhabiters of Seir, then they helped to destroy each other.

Judges 7:22

And as the three hundred blew with trumpets, the LORD set every man's sword upon his neighbour, throughout all the host. And the host fled until they came to Bethshittah, to Zererah, and to the edge of Abelmeholah beside Tabbath.

1 Samuel 14:20

And Saul cried, and all the people that were with him, and went to battle. And behold every man's sword was against his fellow, with a mighty great slaughter.

Genesis 14:6

and the Horites in their own mount Seir unto the plain of Elparan, which bordereth upon the wilderness.

Genesis 36:8-9

Thus dwelt Esau in mount Seir, which Esau is called Edom.

Deuteronomy 2:5

that ye provoke them not, 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 to possess.

Joshua 24:4

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

Ezekiel 35:2-3

"Thou son of man, turn thy face toward the mount Seir, prophesy upon 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 in their own mount Seir unto the plain of Elparan, which bordereth upon the wilderness.
Genesis 36:8
Thus dwelt Esau in mount Seir, which Esau is called Edom.
Deuteronomy 2:5
that ye provoke them not, 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 to possess.
Joshua 24:4
And I gave unto Isaac, Jacob and Esau. And I gave unto Esau mount Seir to possess it. But Jacob and his children went down into Egypt.
Ezekiel 35:2
"Thou son of man, turn thy face toward the mount Seir, prophesy upon it,