Sunan Abi Dawud, Hadith 4316 ⓘ
Narrated Abdullah ibn Umar: Nafi' told that Ibn Umar used to say: I swear by Allah that I do not doubt that Antichrist is Ibn Sayyad.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا يَعْقُوبُ، - يَعْنِي ابْنَ عَبْدِ الرَّحْمَنِ - عَنْ مُوسَى بْنِ عُقْبَةَ، عَنْ نَافِعٍ، قَالَ كَانَ ابْنُ عُمَرَ يَقُولُ وَاللَّهِ مَا أَشُكُّ أَنَّ الْمَسِيحَ الدَّجَّالَ ابْنُ صَيَّادٍ .
also referenced under: Hadith 4330 (DarusSalam) & Book 37, Hadith 4316 (USC-MSA)