Mukhtasar Bukhari

Sayyiduna Miqdad bin Amr Kindi (may Allah be pleased with him), who was an ally of Banu Zuhrah and also participated in the Battle of Badr, says: I asked the Messenger of Allah (peace and blessings of Allah be upon him), "What do you say about this: if I meet a disbeliever (in battle) and we both strive to kill each other, and he (the disbeliever) strikes my hand with a sword and cuts it off, then he takes refuge behind a tree and says, 'I have submitted to Allah (become a Muslim),' should I kill him after he says this?" The Messenger of Allah (peace and blessings of Allah be upon him) said, "No, do not kill him." I said, "O Messenger of Allah! He has cut off one of my hands, and after cutting it off, he says (that he has become a Muslim)." The Messenger of Allah (peace and blessings of Allah be upon him) said, "Do not kill him, for if you do, he will attain the rank you had before you killed him, and your condition will become like his was before he recited the testimony of Islam."