Deuteronomy 33:29

29 Happy are you, Israel:  Who is like you, a people saved by Yahweh,  The shield of your help,  The sword of your excellency!  Your enemies shall submit themselves to you;  You shall tread on their high places.

Isaiah 27:1

1 In that day Yahweh with his hard and great and strong sword will punish leviathan the swift serpent, and leviathan the crooked serpent; and he will kill the monster that is in the sea. 

Ephesians 6:17

17 And take the helmet of salvation, and the sword of the Spirit, which is the word of God;