Narrated Abu Sa`id Al-Khudri:
Allah's Messenger (s.a.w.a.) told us a long narrative about Ad-Dajjal, and among the many things he mentioned, was his saying, "Ad-Dajjal will come and it will be forbidden for him to pass through the entrances of Medina. He will land in some of the salty barren areas (outside) Medina; on that day the best man or one of the best men will come up to him and say, 'I testify that you are the same Dajjal whose description was given to us by Allah's Messenger (s.a.w.a.) .' Ad-Dajjal will say to the people, 'If I kill this man and bring him back to life again, will you doubt my claim?' They will say, 'No.' Then Ad-Dajjal will kill that man and bring him back to life. That man will say, 'Now I know your reality better than before.' Ad-Dajjal will say, 'I want to kill him but I cannot.' "
Narrated Abu Sa`id:
One day Allah's Messenger (s.a.w.a.) narrated to us a long narration about Ad-Dajjal and among the things he narrated to us, was: "Ad-Dajjal will come, and he will be forbidden to enter the mountain passes of Medina. He will encamp in one of the salt areas neighboring Medina and there will appear to him a man who will be the best or one of the best of the people. He will say 'I testify that you are Ad-Dajjal whose story Allah's Messenger (s.a.w.a.) has told us.' Ad-Dajjal will say (to his audience), 'Look, if I kill this man and then give him life, will you have any doubt about my claim?' They will reply, 'No,' Then Ad- Dajjal will kill that man and then will make him alive. The man will say, 'By Allah, now I recognize you more than ever!' Ad-Dajjal will then try to kill him (again) but he will not be given the power to do so."
Abu Sa'id al-Khudri reported that Allah's Messenger (s.a.w.a.) one day gave a detailed account of the Dajjal and in that it was also included:
He would come but would not be allowed to enter the mountain passes to Medina. So he will alight at some of the barren tracts near Medina, and a person who would be the best of men or one from amongst the best of men would say to him: I bear testimony to the fact that you are Dajjal about whom Allah's Messenger (s.a.w.a.) had informed us. The Dajjal would say: What is your opinion if I kill this (person), then I bring him back to life; even then will you harbour doubt in this matter? They would say: No. He would then kill (the man) and then bring him back to life. When he would bring that person to life, he would say: By Allah, I had no better proof of the fact (that you are a Dajjal) than at the present time (that you are actually so). The Dajjal would then make an attempt to kill him (again) but he would not be able to do that. Abu Ishaq reported that it was said: That person would be Khadir (Allah be pleased with him).