Reply #56: Well, strictly speaking, it's Biblical

[Euromutt]

Matthew 26:52, albeit it with the technology updated a bit.

51 And lo, one of those with Jesus, having stretched forth the hand, drew his sword, and having struck the servant of the chief priest, he took off his ear.

52 Then saith Jesus to him, `Turn back thy sword to its place; for all who did take the sword, by the sword shall perish;

(Young's Literal Translation, emphasis mine)

Of course, in Luke 22:36, Jesus tells his followers that any of them who doesn't have a sword should sell his cloak and buy one, so it's not as if you can get any consistent advice from the Gospels. Which isn't surprising, given that they're riddled with inconsistencies.