Messenger of Allah ﷺ said, "The blood of a Muslim who confesses that none has the right to be worshipped but Allah and that I am His Apostle, cannot be shed except in three cases: In Qisas for murder, a married person who commits illegal sexual intercourse and the one who reverts from Islam (apostate) and leaves the Muslims."  

قَالَ رَسُولُ اللَّهِ ﷺ: «لاَ يَحِلُّ دَمُ امْرِئٍ مُسْلِمٍ يَشْهَدُ أَنْ لاَ إِلَهَ إِلاَّ اللَّهُ وَأَنِّي رَسُولُ اللَّهِ إِلاَّ بِإِحْدَى ثَلاَثٍ: (١) النَّفْسُ بِالنَّفْسِ، (٢) وَالثَّيِّبُ الزَّانِي، (٣) وَالْمَارِقُ مِنَ الدِّينِ التَّارِكُ الْجَمَاعَةَ۔»