Muhammad ibn al-Munkadir told that he saw Jabir ibn Abdullah swearing by Allah that Ibn as-Saeed 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 Messenger of Allah ﷺ, but the Messenger of Allah ﷺ did not make any objection to it.