Samson was the first terrorist.
Now the house was full of men and women ... about three thousand men and women.... And Samson called unto the LORD, and said ... strengthen me ... that I may be at once avenged of the Philistines.... And Samson took hold of the two middle pillars upon which the house stood..... And Samson said, Let me die with the Philistines. And he bowed himself with all his might; and the house fell upon the lords, and upon all the people that were therein. So the dead which he slew at his death were more than they which he slew in his life. Judges 16:27-30
God is the greatest terrorist.
The terror of God was upon the cities that were round about them. Genesis 35:5
I will send my fear before thee. Exodus 23:27
This day will I begin to put the dread of thee and the fear of thee upon the nations that are under the whole heaven, who shall hear report of thee, and shall tremble, and be in anguish because of thee. Deuteronomy 2:25
... by war, and by a mighty hand, and by a stretched out arm, and by great terrors.... Deuteronomy 4:34
Knowing therefore the terror of the Lord, we persuade men. 2 Corinthians 5:11