ENOfficial
It was narrated from Abu Sa'eed Al-Khudri that the Messenger of Allah (ﷺ) said: "A group will secede at a time of division among the people, and they will be killed by the group that is closer to the truth."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، حَدَّثَنَا عَبْدُ الأَعْلَى، حَدَّثَنَا دَاوُدُ، عَنْ أَبِي نَضْرَةَ، عَنْ أَبِي، سَعِيدٍ الْخُدْرِيِّ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " تَمْرُقُ مَارِقَةٌ فِي فُرْقَةٍ مِنَ النَّاسِ فَيَلِي قَتْلَهُمْ أَوْلَى الطَّائِفَتَيْنِ بِالْحَقِّ " .
sunnah.com