In the hadeeth of al-Nawwaas ibn Sam’aan (رضي الله عنه) about the Dajjaal, it is reported that the Sahaabah asked:
“O Messenger of Allaah, how long will he (Dajjal) stay on the earth?”
“Forty days: one day like a year, one day like a month, one day like a week, and the rest of the days like your days.”
“How fast will he travel through the earth?”
“Like the clouds when they are driven by the wind. He will come to some people and call them, and they will believe in him and respond to him. Then he will command the sky to rain, and the earth to bring forth vegetation, and their cattle will come back to them in the evening, with their humps very high, their udders full of milk, and their flanks stretched. Then he will come to other people and will call them, but they will reject him. So he will leave them and they will be stricken with famine, with none of their wealth in their hands.
He will pass by ruins and will say, ‘Bring forth your treasure!’ – and the treasure will follow him like a swarm of bees. Then he will call a man who is brimming with youth and will strike him with a sword and cut him in two, then (he will put the pieces apart from one another) the distance of an archer from his target. Then he will call him, and the young man will come forward smiling, with his face shining.”
Al-Bukhaari narrated from Abu Sa’eed al-Khudri (رضي الله عنه) that this man whom the Dajjaal will kill will be one of the best people, who will go out to the Dajjaal from the city of the Messenger of Allaah (ﷺ), and will say to the Dajjaal, “I bear witness that you are the Dajjaal of whom the Messenger of Allaah (ﷺ) told us.” The Dajjaal will say (to the people): “What do you think – if I kill this man then bring him back to life, will you have any doubts?” They will say, “No.” So he will kill him, then bring him back to life. Then he (the believing man) will say, “By Allaah, I have never been more sure about you than I am today.” The Dajjaal will want to kill him but will not be permitted to.
(Bukhaari, no. 6599)
According to the hadeeth of Umaamah al-Baahili (رضي الله عنه), the Prophet (ﷺ) said of the Dajjaal: “Part of his fitnah will be that he will say to a Bedouin, ‘Do you think that if I resurrect your father and mother for you that you will testify that I am your lord?’ He will say, ‘Yes.’ So two devils will appear to him in the image of his father and mother, saying, ‘O my son, follow him for he is your lord.’”
(Narrated by Ibn Maajah, no. 4067. Classed as Saheeh by al-Albaani, Saheeh al-Jaami’ al-Sagheer, hadeeth 7752). إِنْ شَاءَ اَللَّه