"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 اللهِ ﷺ إِنَّهَا سَتَكُونُ بَعْدِي هَنَاتٌ وَهَنَاتٌ وَرَفَعَ يَدَيْهِ فَمَنْ رَأَيْتُمُوهُ يُفَرِّقُ بَيْنَ أُمَّةِ مُحَمَّدٍ ﷺ وَهُمْ جَمِيعٌ فَاقْتُلُوهُ كَائِنًا مَنْ كَانَ مِنَ النَّاسِ  

I have heard the Messenger of Allah ﷺ say: Different evils will make their appearance in the near future. Anyone who tries to disrupt the affairs of this Umma while they are united you should strike him with the sword whoever he be. (If remonstrance does not prevail with him and he does not desist from his disruptive activities, he is to be killed.) (Using translation from Muslim 1852a)  

سَمِعْتُ رَسُولَ اللهِ ﷺ يَقُولُ إِنَّهُ سَتَكُونُ هَنَاتٌ وَهَنَاتٌ فَمَنْ أَرَادَ أَنْ يُفَرِّقَ أَمْرَ هَذِهِ الْأُمَّةِ وَهِيَ جَمِيعٌ فَاضْرِبُوهُ بِالسَّيْفِ كَائِنًا مَنْ كَانَ