Sahih Bukhari Volume 9, Book 87, Hadith 6867

حَدَّثَنَا عَبْدَانُ، حَدَّثَنَا عَبْدُ اللَّهِ، حَدَّثَنَا يُونُسُ، عَنِ الزُّهْرِيِّ، حَدَّثَنَا عَطَاءُ بْنُ يَزِيدَ، أَنَّ عُبَيْدَ اللَّهِ بْنَ عَدِيٍّ، حَدَّثَهُ أَنَّ الْمِقْدَادَ بْنَ عَمْرٍو الْكِنْدِيَّ حَلِيفَ بَنِي زُهْرَةَ حَدَّثَهُ وَكَانَ، شَهِدَ بَدْرًا مَعَ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ إِنْ لَقِيتُ كَافِرًا فَاقْتَتَلْنَا، فَضَرَبَ يَدِي بِالسَّيْفِ فَقَطَعَهَا، ثُمَّ لاَذَ بِشَجَرَةٍ وَقَالَ أَسْلَمْتُ لِلَّهِ‏.‏ آقْتُلُهُ بَعْدَ أَنْ قَالَهَا قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ لاَ تَقْتُلْهُ ‏"‏‏.‏ قَالَ يَا رَسُولَ اللَّهِ فَإِنَّهُ طَرَحَ إِحْدَى يَدَىَّ، ثُمَّ قَالَ بَعْدَ مَا قَطَعَهَا، آقْتُلُهُ قَالَ ‏"‏ لاَ تَقْتُلْهُ، فَإِنْ قَتَلْتَهُ فَإِنَّهُ بِمَنْزِلَتِكَ قَبْلَ أَنْ تَقْتُلَهُ، وَأَنْتَ بِمَنْزِلَتِهِ قَبْلَ أَنْ يَقُولَ كَلِمَتَهُ الَّتِي قَالَ ‏"‏‏

Narrated By Al-Miqdad bin 'Amr Al-Kindi : An ally of Bani Zuhra who took part in the battle of Badr with the Prophet, that he said, "O Allah's Apostle! If I meet an unbeliever and we have a fight, and he strikes my hand with the sword and cuts it off, and then takes refuge from me under a tree, and says, 'I have surrendered to Allah (i.e. embraced Islam),' may I kill him after he has said so?" Allah's Apostle said, "Do not kill him." Al-Miqdad said, "But O Allah's Apostle! He had chopped off one of my hands and he said that after he had cut it off. May I kill him?" The Prophet said. "Do not kill him for if you kill him, he would be in the position in which you had been before you kill him, and you would be in the position in which he was before he said the sentence."