Abu Huraira reported: The Messenger of Allah, peace and blessings be upon him, said, “The Hour will not be established until two groups fight each other. There will be a massive slaughter between them and their claim is one and the same. The Hour will not be established until close to thirty lying impostors appear, each one imagining that he is the messenger of Allah.”
Source: Ṣaḥīḥ al-Bukhārī 3413, Ṣaḥīḥ Muslim 157
Grade: Muttafaqun Alayhi (authenticity agreed upon) according to Al-Bukhari and Muslim
عَنْ أَبِي هُرَيْرَةَ رَضِيَ اللَّهُ عَنْهُ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ لَا تَقُومُ السَّاعَةُ حَتَّى يَقْتَتِلَ فِئَتَانِ فَيَكُونَ بَيْنَهُمَا مَقْتَلَةٌ عَظِيمَةٌ دَعْوَاهُمَا وَاحِدَةٌ وَلَا تَقُومُ السَّاعَةُ حَتَّى يُبْعَثَ دَجَّالُونَ كَذَّابُونَ قَرِيبًا مِنْ ثَلَاثِينَ كُلُّهُمْ يَزْعُمُ أَنَّهُ رَسُولُ اللَّهِ
3413 صحيح البخاري كتاب المناقب باب علامات النبوة في الإسلام
157 صحيح مسلم كتاب الفتن وأشراط الساعة