live by the sword, die by the sword 

It means those who spend all their time seeking violence and trying to kill others are destined to find the violence they seek and die instead. It is meant as a warning to not seek fights, but to try to find peaceful resolutions to problems if at all possible (a sentiment that is too often forgotten and sorely needed in this world).

You hear about Blake? He thought he was all that and went to front with the guys in the barro. Even with his piece, he ended up fufilling the old saying, live by the sword, die by the sword.

live by the sword, die by the sword by Raven Knight January 9, 2005

live by the sword, die by the sword 

This expression was adapted from Jesus’ words to His disciple Peter in Matthew 26:52--But Jesus said to him, "Put your sword in its place, for all who take the sword will perish by the sword."

An idiom meaning “what goes around comes around.” More to the point, “if you use violent, forceful, or underhanded methods against other people, you can expect those same methods to be used against you.”

A person who lives violently will probably at some point be killed in a violent manner.

The expression "live by the sword, die by the sword" was contemporized to "live by the gun, die by the gun."

live by the sword, die by the sword by KindleRashod May 24, 2018

live by the sword, die by the sword 

Alternatively, a saying that also reminds you not to expect last-minute change.

live by the sword, die by the sword:
If you live by the sword, don't evpect to die in peace.

live by the sword, die by the sword by TanonX December 28, 2005