Live by the sword, die by the sword

The Arrest of Christ (c. 1500) by the Master of the Evora Altarpiece, showing Jesus intervening after one of the disciples cut off the ear of the servant of the high priest Caiaphas

"Live by the sword, die by the sword" is a proverb in the form of a parallel phrase, derived from the Gospel of Matthew (Matthew 26, 26:52): "Then said Jesus unto him, Put up again thy sword into his place: for all they that take the sword shall perish with the sword."