The prohibition of killing a disbeliever after he says La ilaha illallah

It is narrated on the authority of Miqdad b. Aswad that he said. Messenger of Allah, you just see (here is a point): If I encountered a person amongst the infidels (in the battlefield) and he attacked me and struck me and cut off one of my hands with the sword. Then he (in order to protect himself from me) took shelter of a tree and said: I become Muslim for Allah's sake. Messenger of Allah, can I kill him after he had uttered this? The Messenger of Allah ﷺ said: Do not kill him. I (the narrator) said: Messenger of Allah, he cut off my hand and uttered this after amputating it;
should I then kill him? The Messenger of Allah ﷺ said: Don't kill him, for I you kill him, verily he would be in a position where you had been before killing him and verily you would be in a position where he had been before uttering (kalima).

حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا لَيْثٌ، ح وَحَدَّثَنَا مُحَمَّدُ بْنُ رُمْحٍ، - وَاللَّفْظُ مُتَقَارِبٌ - أَخْبَرَنَا اللَّيْثُ، عَنِ ابْنِ شِهَابٍ، عَنْ عَطَاءِ بْنِ يَزِيدَ اللَّيْثِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَدِيِّ بْنِ الْخِيَارِ، عَنِ الْمِقْدَادِ بْنِ الأَسْوَدِ، أَنَّهُ أَخْبَرَهُ أَنَّهُ، قَالَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِنْ لَقِيتُ رَجُلاً مِنَ الْكُفَّارِ فَقَاتَلَنِي فَضَرَبَ إِحْدَى يَدَىَّ بِالسَّيْفِ فَقَطَعَهَا . ثُمَّ لاَذَ مِنِّي بِشَجَرَةٍ فَقَالَ أَسْلَمْتُ لِلَّهِ . أَفَأَقْتُلُهُ يَا رَسُولَ اللَّهِ بَعْدَ أَنْ قَالَهَا قَالَ رَسُولُ اللَّهِ ﷺ " لاَ تَقْتُلْهُ " . قَالَ فَقُلْتُ يَا رَسُولَ اللَّهِ إِنَّهُ قَدْ قَطَعَ يَدِي ثُمَّ قَالَ ذَلِكَ بَعْدَ أَنْ قَطَعَهَا أَفَأَقْتُلُهُ قَالَ رَسُولُ اللَّهِ ﷺ " لاَ تَقْتُلْهُ فَإِنْ قَتَلْتَهُ فَإِنَّهُ بِمَنْزِلَتِكَ قَبْلَ أَنْ تَقْتُلَهُ وَإِنَّكَ بِمَنْزِلَتِهِ قَبْلَ أَنْ يَقُولَ كَلِمَتَهُ الَّتِي قَالَ " .

The same hadith has been transmitted by the same chain of narrators. The hadith transmitted by Auza'i and Ibn Juraij contains these words: I embraced Islam for Allah's sake. and in the hadith narrated by Ma'mar the words are: I knelt down to kill him, that he said;
There is no god but Allah.

حَدَّثَنَا إِسْحَاقُ بْنُ إِبْرَاهِيمَ، وَعَبْدُ بْنُ حُمَيْدٍ، قَالاَ أَخْبَرَنَا عَبْدُ الرَّزَّاقِ، قَالَ أَخْبَرَنَا مَعْمَرٌ، ح وَحَدَّثَنَا إِسْحَاقُ بْنُ مُوسَى الأَنْصَارِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، عَنِ الأَوْزَاعِيِّ، ح وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، جَمِيعًا عَنِ الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ أَمَّا الأَوْزَاعِيُّ وَابْنُ جُرَيْجٍ فَفِي حَدِيثِهِمَا قَالَ أَسْلَمْتُ لِلَّهِ . كَمَا قَالَ اللَّيْثُ فِي حَدِيثِهِ . وَأَمَّا مَعْمَرٌ فَفِي حَدِيثِهِ فَلَمَّا أَهْوَيْتُ لأَقْتُلَهُ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ .

It is narrated by Miqdad, and he was an ally of B. Zuhra and was of those who participated in the Battle of Badr along with the Messenger of Allah, that he said: Messenger of Allah, here is a point: If I happened to encounter a person amongst the infidels (in the battle). Then he narrated a hadith similar to the one transmitted by Laith.

وَحَدَّثَنِي حَرْمَلَةُ بْنُ يَحْيَى، أَخْبَرَنَا ابْنُ وَهْبٍ، قَالَ أَخْبَرَنِي يُونُسُ، عَنِ ابْنِ شِهَابٍ، قَالَ حَدَّثَنِي عَطَاءُ بْنُ يَزِيدَ اللَّيْثِيُّ، ثُمَّ الْجُنْدَعِيُّ أَنَّ عُبَيْدَ، اللَّهِ بْنَ عَدِيِّ بْنِ الْخِيَارِ أَخْبَرَهُ أَنَّ الْمِقْدَادَ بْنَ عَمْرِو بْنِ الأَسْوَدِ الْكِنْدِيَّ - وَكَانَ حَلِيفًا لِبَنِي زُهْرَةَ وَكَانَ مِمَّنْ شَهِدَ بَدْرًا مَعَ رَسُولِ اللَّهِ ﷺ - أَنَّهُ قَالَ يَا رَسُولَ اللَّهِ أَرَأَيْتَ إِنْ لَقِيتُ رَجُلاً مِنَ الْكُفَّارِ ثُمَّ ذَكَرَ بِمِثْلِ حَدِيثِ اللَّيْثِ .

It is narrated on the authority of Usama b. Zaid that the Messenger of Allah ﷺ sent us in a raiding party. We raided Huraqat of Juhaina in the morning. I caught hold of a man and he said: There is no god but Allah, I attacked him with a spear. It once occurred to me and I talked about it to the Apostle ﷺ. The Messenger of Allah ﷺ said: Did he profess" There is no god but Allah," and even then you killed him? I said: Messenger of Allah, he made a profession of it out of the fear of the weapon. He (the Holy Prophet) observed: Did you tear his heart in order to find out whether it had professed or not? And he went on repeating it to me till I wished I had embraced Islam that day. Sa'd said: By Allah, I would never kill any Muslim so long as a person with a heavy belly, i. e., Usama, would not kill. Upon this a person remarked: Did Allah not say this: And fight them until there is no more mischief and religion is wholly for Allah? Sa'd said: We fought so that there should be no mischief, but you and your companions wish to fight so that there should be mischief.

حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ، ح وَحَدَّثَنَا أَبُو كُرَيْبٍ، وَإِسْحَاقُ بْنُ إِبْرَاهِيمَ، عَنْ أَبِي مُعَاوِيَةَ، كِلاَهُمَا عَنِ الأَعْمَشِ، عَنْ أَبِي ظِبْيَانَ، عَنْ أُسَامَةَ بْنِ زَيْدٍ، وَهَذَا، حَدِيثُ ابْنِ أَبِي شَيْبَةَ قَالَ بَعَثَنَا رَسُولُ اللَّهِ ﷺ فِي سَرِيَّةٍ فَصَبَّحْنَا الْحُرَقَاتِ مِنْ جُهَيْنَةَ فَأَدْرَكْتُ رَجُلاً فَقَالَ لاَ إِلَهَ إِلاَّ اللَّهُ . فَطَعَنْتُهُ فَوَقَعَ فِي نَفْسِي مِنْ ذَلِكَ فَذَكَرْتُهُ لِلنَّبِيِّ ﷺ فَقَالَ رَسُولُ اللَّهِ ﷺ " أَقَالَ لاَ إِلَهَ إِلاَّ اللَّهُ وَقَتَلْتَهُ " . قَالَ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّمَا قَالَهَا خَوْفًا مِنَ السِّلاَحِ . قَالَ " أَفَلاَ شَقَقْتَ عَنْ قَلْبِهِ حَتَّى تَعْلَمَ أَقَالَهَا أَمْ لاَ " . فَمَازَالَ يُكَرِّرُهَا عَلَىَّ حَتَّى تَمَنَّيْتُ أَنِّي أَسْلَمْتُ يَوْمَئِذٍ . قَالَ فَقَالَ سَعْدٌ وَأَنَا وَاللَّهِ لاَ أَقْتُلُ مُسْلِمًا حَتَّى يَقْتُلَهُ ذُو الْبُطَيْنِ . يَعْنِي أُسَامَةَ قَالَ قَالَ رَجُلٌ أَلَمْ يَقُلِ اللَّهُ { وَقَاتِلُوهُمْ حَتَّى لاَ تَكُونَ فِتْنَةٌ وَيَكُونَ الدِّينُ كُلُّهُ لِلَّهِ} فَقَالَ سَعْدٌ قَدْ قَاتَلْنَا حَتَّى لاَ تَكُونَ فِتْنَةٌ وَأَنْتَ وَأَصْحَابُكَ تُرِيدُونَ أَنْ تُقَاتِلُوا حَتَّى تَكُونَ فِتْنَةٌ .

It is narrated on the authority of Usama b. Zaid: The Messenger of Allah may peace be upon him) sent us to Huraqat, a tribe of Juhaina. We attacked that tribe early in the morning and defeated them and I and a man from the Ansar caught hold of a person (of the defeated tribe). When we overcame him, he said: There is no god but Allah. At that moment the Ansari spared him, but I attacked him with my spear and killed him. The news had already reached the Apostle ﷺ, so when we came back he (the Apostle) said to me: Usama, did you kill him after he had made the profession: There is no god but Allah? I said. Messenger of Allah, he did it only as a shelter. The Holy Prophet observed: Did you kill him after he had made the profession that there is no god but Allah? He (the Holy Prophet) went on repeating this to me till I wished I had not embraced Islam before that day.

حَدَّثَنَا يَعْقُوبُ الدَّوْرَقِيُّ، حَدَّثَنَا هُشَيْمٌ، أَخْبَرَنَا حُصَيْنٌ، حَدَّثَنَا أَبُو ظِبْيَانَ، قَالَ سَمِعْتُ أُسَامَةَ بْنَ زَيْدِ بْنِ حَارِثَةَ، يُحَدِّثُ قَالَ بَعَثَنَا رَسُولُ اللَّهِ ﷺ إِلَى الْحُرَقَةِ مِنْ جُهَيْنَةَ فَصَبَّحْنَا الْقَوْمَ فَهَزَمْنَاهُمْ وَلَحِقْتُ أَنَا وَرَجُلٌ مِنَ الأَنْصَارِ رَجُلاً مِنْهُمْ فَلَمَّا غَشَيْنَاهُ قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ . فَكَفَّ عَنْهُ الأَنْصَارِيُّ وَطَعَنْتُهُ بِرُمْحِي حَتَّى قَتَلْتُهُ . قَالَ فَلَمَّا قَدِمْنَا بَلَغَ ذَلِكَ النَّبِيَّ ﷺ فَقَالَ لِي " يَا أُسَامَةُ أَقَتَلْتَهُ بَعْدَ مَا قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ " . قَالَ قُلْتُ يَا رَسُولَ اللَّهِ إِنَّمَا كَانَ مُتَعَوِّذًا . قَالَ فَقَالَ " أَقَتَلْتَهُ بَعْدَ مَا قَالَ لاَ إِلَهَ إِلاَّ اللَّهُ " . قَالَ فَمَازَالَ يُكَرِّرُهَا عَلَىَّ حَتَّى تَمَنَّيْتُ أَنِّي لَمْ أَكُنْ أَسْلَمْتُ قَبْلَ ذَلِكَ الْيَوْمِ .