that the Prophet ﷺ said: "Indeed, whoever kills a Mu'ahid that has a covenant from Allah and a covenant from His Messenger ﷺ, then he has violated the covenant with Allah and the covenant of His Messenger, so he shall not smell the fragrance of Paradise; even though its fragrance can be sensed from the distance of seventy autumns."  

عَنِ النَّبِيِّ ﷺ قَالَ أَلاَ مَنْ قَتَلَ نَفْسًا مُعَاهِدَةً لَهُ ذِمَّةُ اللَّهِ وَذِمَّةُ رَسُولِهِ فَقَدْ أَخْفَرَ بِذِمَّةِ اللَّهِ فَلاَ يَرَحْ رَائِحَةَ الْجَنَّةِ وَإِنَّ رِيحَهَا لَيُوجَدُ مِنْ مَسِيرَةِ سَبْعِينَ خَرِيفًا قَالَ وَفِي الْبَابِ عَنْ أَبِي بَكْرَةَ