[Machine] The Messenger of Allah ﷺ said, "Cursed is the one who causes division." This is a authentic narration and they did not mention its narrator. Its explanation is mentioned in the hadith of Abu Ayyub Al-Ansari, which is authentic.
قَالَ رَسُولُ اللَّهِ ﷺ «مَلْعُونٌ مَنْ فَرَّقَ» هَذَا إِسْنَادٌ صَحِيحٌ وَلَمْ يُخَرِّجَاهُ وَتَفْسِيرُهُ فِي حَدِيثِ أَبِي أَيُّوبَ الْأَنْصَارِيِّ الَّذِي صحيح