(5) باب ذِكْرِ مَا يَحِلُّ بِهِ دَمُ الْمُسْلِمِ
It was narrated that 'Amr bin Ghalib said:
"Aishah said: 'O 'Ammar! Do you not know that it is not permissible to shed the blood of a Muslim except in three cases: a life for a life, a man who commits adultery after being married.'"
Reference: Sunan an-Nasa'i 4018
In-book reference: Book 37, Hadith 53
English translation: Vol. 5, Book 37, Hadith 4023