Sahih Muslim 2916
Sahih Muslim · Book 54: The Book of Tribulations and Portents of the Last Hour · The Hour Will Not Begin Until A Man Passes By Another Man's Grave And Wishes That He Was In The Place Of The Deceased, Because Of Calamity
Umm Salama reported that Allah's Messenger (ﷺ) said:
وَحَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ ، حَدَّثَنَا إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ ، عَنِ ابْنِ عَوْنٍ ، عَنِ الْحَسَنِ ، عَنْ أُمِّهِ ، عَنْ أُمِّ سَلَمَةَ ، قَالَتْ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " تَقْتُلُ عَمَّارًا الْفِئَةُ الْبَاغِيَةُ " .
A band of rebels would kill `Ammar.