وَعَنْ عَائِشَةَ رَضِيَ اَللَّهُ عَنْهَا
عَنْ رَسُولِ اَللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ: «لَا يَحِلُّ قَتْلُ مُسْلِمٍ إِلَّا فِي إِحْدَى ثَلَاثِ خِصَالٍ: زَانٍ مُحْصَنٌ فَيُرْجَمُ، وَرَجُلٌ يَقْتُلُ مُسْلِمًا مُتَعَمِّدًا فَيُقْتَلُ، وَرَجُلٌ يَخْرُجُ مِنْ اَلْإِسْلَامِ فَيُحَارِبُ اَللَّهَ وَرَسُولَهُ، فَيُقْتَلُ، أَوْ يُصْلَبُ، أَوْ يُنْفَى مِنْ اَلْأَرْضِ»
“The blood of a Muslim is not to be shed except for three reasons: a married man who committed adultery, a man who kills another Muslim intentionally for which he must be killed (in Qisas or retaliation), and a man who abandons Islam and fights against Allah and His Messenger, in which case he should be either killed, crucified, or exiled.” Related by Abu Dawud and An-Nasai. Al-Hakim graded it as Sahih.