What is the punishment for murder in the Quran and the conditions for its implementation, what are the crimes that warrant it and the methods of carrying out the sentence, does Islam prefer punishment or mercy in this case, what are the benefits and drawbacks of the death penalty, what is the fate of the murderer in specific cases, and what is the view of Judaism and Christianity on this punishment?

The punishment for murder in Islam varies according to its type. Intentional murder is punishable by Qisas (retaliation in kind) if the victim's guardian does not pardon the killer. Unintentional murder, on the other hand, entails blood money (Diyya) and expiation (Kaffara).

As for the execution of the killing, it should be done by the quickest possible means, except in certain cases like Qisas, where the killer is killed by the same method they used to kill. The married fornicator is killed by stoning.

Islam is a religion of mercy, and the prescription of Qisas and other punishments is out of mercy for all people. These punishments expiate the sins of criminals, deter them from committing crimes, and provide safety for others. Allah says: (And there is for you in Qisas [retaliation] life, O you [people] of understanding, that you may become righteous) [Quran 2:179].

Qisas is established in the Jewish law, as is the stoning of the married person. As for Christianity, which follows the law of Moses, it states: (And We ordained for them therein a life for a life, and an eye for an eye, and a nose for a nose, and an ear for an ear, and a tooth for a tooth, and for wounds is Qisas) [Quran 5:45].