‘Imran ibn Husayn reported: The Messenger of Allah, peace and blessings be upon him, said, “Nothing between the creation of Adam until the establishment of the Hour is a greater tribulation than the affair of the False Messiah.”
Source: Ṣaḥīḥ Muslim 2946
Grade: Sahih (authentic) according to Muslim
عن عمران بن حصين قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَا بَيْنَ خَلْقِ آدَمَ إِلَى قِيَامِ السَّاعَةِ خَلْقٌ أَكْبَرُ مِنْ الدَّجَّالِ
2946 صحيح مسلم كتاب الفتن وأشراط الساعة