Matthew 26:52
"Put back your sword again," said Jesus, "for all who draw the sword shall perish by the sword.
Revelation 13:10
If any one is eager to lead others into captivity, he must himself go into captivity. If any one is bent on killing with the sword, he must himself be killed by the sword. Here is an opportunity for endurance, and for the exercise of faith, on the part of God's people.
James 3:9
With it we bless the Lord and Father, and with it we curse men, who are made in God's likeness.
Romans 13:4
For he is God's servant for your benefit. But if you do what is wrong, be afraid. He does not wear the sword to no purpose: he is God's servant--an administrator to inflict punishment upon evil-doers.