Abu Dawud
Battles
Book Number: 032 / Hadith Number: 4317
Narated By Jabir ibn Abdullah : Muhammad ibn al-Munkadir told that he saw Jabir ibn Abdullah swearing by Allah that Ibn as-Sa'id was the Dajjal (Antichrist). I expressed my surprise by saying: You swear by Allah! He said: I heard Umar swearing to that in the presence of the Apostle of Allah (pbuh), but the Apostle of Allah (pbuh) did not make any objection to it.