Verses with the word horror in the Old Testament (4 verses):

Genesis 15:12
And when the sun was going down, a deep sleep fell upon Abram; and, lo, an horror of great darkness fell upon him.

Psalms 55:5
Fearfulness and trembling are come upon me, and horror hath overwhelmed me.

Psalms 119:53
Horror hath taken hold upon me because of the wicked that forsake thy law.

Ezekiel 7:18
They shall also gird themselves with sackcloth, and horror shall cover them; and shame shall be upon all faces, and baldness upon all their heads.