«الْقَتْلُ أَنْفَى لِلْقَتْلِ»
Killing is more effective in preventing killing.
The familiar maxim uses a repeated word for killing to suggest deterrence. The Qur’anic wording instead places ḥayāh, “life,” at the center, shifting attention from a negative prevention to a positive objective.
Preventing murder and preserving life are closely related, but not rhetorically interchangeable. One foregrounds what is stopped; the other foregrounds what is secured.