2 Chronicles 20:23

when the people of Ammon and Moab rose up against the inhabitants of Mount Seir to destroy and demolish [them]. And when the inhabitants of Seir had made an end of them, each helped to destroy his comrade.

Judges 7:22

When they blew the three hundred trumpets, Yahweh set [the] sword of each one against his neighbor throughout the whole camp, and the camp fled as far as Beth Shittah toward Zererah, up to Abel Meholah, the border by Tabbath.

1 Samuel 14:20

Then Saul and all the troops who were with him were assembled on command and came up to the battle, and look! Each [Philistine's] sword [was] against his friend; [and there was] a very great confusion.

Genesis 14:6

And the Horites in their hill country of Seir, as far as El-Paran, which is at the wilderness.

Genesis 36:8-9

So Esau dwelled in the hill country of Seir (Esau, that [is] Edom).

Deuteronomy 2:5

Do not get involved in battle with them, for I will not give you any of their land, not even {a foot's breadth} [of it]; since I have given Mount Seir [as] a possession for Esau.

Joshua 24:4

and to Isaac I gave Jacob and Esau. To Esau I gave the hill country of Seir to possess, but Jacob and his children went down [to] Egypt.

Ezekiel 35:2-3

"Son of man, set your face against the mountain of 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 in their hill country of Seir, as far as El-Paran, which is at the wilderness.
Genesis 36:8
So Esau dwelled in the hill country of Seir (Esau, that [is] Edom).
Deuteronomy 2:5
Do not get involved in battle with them, for I will not give you any of their land, not even {a foot's breadth} [of it]; since I have given Mount Seir [as] a possession for Esau.
Joshua 24:4
and to Isaac I gave Jacob and Esau. To Esau I gave the hill country of Seir to possess, but Jacob and his children went down [to] Egypt.
Ezekiel 35:2
"Son of man, set your face against the mountain of Seir and prophesy against it,