"The Prophet [SAW] said: 'After me there will be many calamities and much evil behavior.' He raised his hands (and said): 'Whomever you see trying to create division among the Ummah of Muhammad [SAW] when they are all united, kill him, no matter who he is among the people.'" (Using translation from Nasāʾī 4021)
قَالَ رَسُولُ اللَّهِ ﷺ «إِنَّهَا سَتَكُونُ بَعْدِي هَنَاتٌ وَهَنَاتٌ وَرَفَعَ يَدَيْهِ فَمَنْ رَأَيْتُمُوهُ يُرِيدُ أَنْ يُفَرِّقَ أَمْرَ أُمَّةِ مُحَمَّدٍ ﷺ وَهُمْ جَمِيعٌ فَاقْتُلُوهُ كَائِنًا مَنْ كَانَ مِنَ النَّاسِ»