The Messenger of Allah ﷺ mentioned the Dajjal (Antichrist) saying, “If he comes forth while I am among you I shall be the one who will dispute with him on your behalf, but if he comes forth when I am not among you, a man must dispute on his own behalf, and Allah will take my place in looking after every Muslim. Those of you who live up to his time should recite over him the opening verses of Sūrah al-Kahf, for they are your protection from his trial.” We asked, “How long will he remain on the earth?” He replied, “Forty days, one like a year, one like a month, one like a week, and rest of his days like yours.” We asked, “Messenger of Allah ﷺ, will one day’s prayer suffice us in this day which will be like a year?” He replied, “No, you must make an estimate of its extent. Then Jesus son of Mary will descend at the white minaret to the east of Damascus. He will then catch him up at the gate of Ludd and kill him.” Reference: Sunan ad-Darimi 4321; A more detailed narration is found in Sahih Muslim 2937