The Sermon on the Mount
Consistent with the Sermon on the Mount, the disciples never used violence against enemies. Jesus told them to flee Jerusalem when war seemed certain. When the Jews imprisoned and murdered believers, those remaining left jobs, houses and families rather than repel his words. Many would consider this cowardice thinking they should stand their ground and fight it out.
But as a follower of Christ, loving your enemies more than your own life, or the life of your loved ones is not cowardice. Jesus told us any who love their own life or their family more than him are not worthy of him. Do we repel his words by arming ourselves and planning to use violence against the enemies we are to love?