The Book of Oaths (qasamah), Retaliation and Blood Money
45/14, 15: Chapter
Seriousness Of Killing The One With A Covenant (Al-Mu'ahad)1
Sunan an-Nasai
أَخْبَرَنَا الْحُسَيْنُ بْنُ حُرَيْثٍ، قَالَ حَدَّثَنَا إِسْمَاعِيلُ، عَنْ يُونُسَ، عَنِ الْحَكَمِ بْنِ الأَعْرَجِ، عَنِ الأَشْعَثِ بْنِ ثُرْمُلَةَ، عَنْ أَبِي بَكْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَنْ قَتَلَ نَفْسًا مُعَاهِدَةً بِغَيْرِ حِلِّهَا حَرَّمَ اللَّهُ عَلَيْهِ الْجَنَّةَ أَنْ يَشُمَّ رِيحَهَا " .
It was narrated that Abu Bakrah said: The Messenger of Allah said: "Whoever kills a Mu'ahad with no justification, Allah will forbid Paradise to him and he will not even smell its fragrance."
Reference : Sunan an-Nasa'i 4748In-book reference : Book 45, Hadith 43English translation : Vol. 5, Book 45, Hadith 4752