Kill believers who fight the Ummah

حَدَّثَنِي أَبُو بَكْرِ بْنُ نَافِعٍ ، وَمُحَمَّدُ بْنُ بَشَّارٍ ، قَالَ ابْنُ نَافِعٍ: حَدَّثَنَا غُنْدَرٌ ، وقَالَ ابْنُ بَشَّارٍ: حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ ، حَدَّثَنَا شُعْبَةُ ، عَنْ زِيَادِ بْنِ عِلَاقَةَ ، قَالَ: سَمِعْتُ عَرْفَجَةَ ، قَالَ: سَمِعْتُ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ ، يَقُولُ: " إِنَّهُ سَتَكُونُ هَنَاتٌ وَهَنَاتٌ ، فَمَنْ أَرَادَ أَنْ يُفَرِّقَ أَمْرَ هَذِهِ الْأُمَّةِ وَهِيَ جَمِيعٌ ، فَاضْرِبُوهُ بِالسَّيْفِ كَائِنًا مَنْ كَانَ "

It has been narrated on the authority of 'Arfaja who said: 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.)

Sahih Muslim 1852a https://sunnah.com/muslim:1852a

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وَحَدَّثَنِي عُثْمَانُ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا يُونُسُ بْنُ أَبِي يَعْفُورٍ، عَنْ أَبِيهِ، عَنْ عَرْفَجَةَ، قَالَ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ ‏ "‏ مَنْ أَتَاكُمْ وَأَمْرُكُمْ جَمِيعٌ عَلَى رَجُلٍ وَاحِدٍ يُرِيدُ أَنْ يَشُقَّ عَصَاكُمْ أَوْ يُفَرِّقَ جَمَاعَتَكُمْ فَاقْتُلُوهُ ‏"‏ ‏.‏

It has been narrated (through a still different chain of transmitters) on the Same authority (i. e. 'Arfaja), who said similarly but adding: " Kill all of them." I heard the Messenger of Allah (ﷺ) say: When you are holding to one single man as your leader, you should kill who seeks to undermine your solidarity or disrupt your unity.

Sahih Muslim 1852c https://sunnah.com/muslim:1852c