(8) باب قَوْلِ النَّبِيِّ صلى الله عليه وسلم "اَ تَقُومُ السَّاعَةُ حَتَّى يَقْتَتِلَ فِئَتَانِ دَعْوَتُهُمَا وَاحِدَةٌ"
Narrated Abu Huraira:
Allah's Messenger (ﷺ) said, "The Hour will not be established till two (huge) groups fight against each other, their claim being one and the same."
Reference: Sahih al-Bukhari 6935
In-book reference: Book 88, Hadith 17
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 9, Book 84, Hadith 69