Abu Sa'id al-Khudri reported Allah's Messenger (ﷺ) as saying

The Dajjal would come forth and a person from amongst the believers would go towards him and the armed men of the Dajjal would meet him and they would say to him: Where do you intend to go? He would say: I intend to go to this one who is coming forth. They would say to him: Don't you believe in our Lord? He would say: There is nothing hidden about our Lord. They would say: Kill him. Then some amongst them would say: Has your master (Dajjal) not forbidden you to kill anyone without (his consent)? And so they would take him to the Dajjal and when the believer would see him, he would say: O people. he is the Dajjil about whom Allah's Messenger (ﷺ) has informed (us). The Dajjal would then order for breaking his head and utter (these words): Catch hold of him and break his head. He would be struck even on his back and on his stomach. Then the Dajjal would ask him: Don't you believe in me? He would say: You are a false Masih. He would then order him to be torn (into pieces) with a saw from the parting of his hair up to his legs. After that the Dajjal would walk between the two pieces. He would then say to him: Stand, and he would stand erect. He would then say to him: Don't you believe in me? And the person would say: It has only added to my insight concerning you (that you are really the Dajjal). He would then say: O people, he would not behave with anyone amongst people (in such a manner) after me. The Dajjal would try to catch hold of him so that he should kill him (again). The space between his neck and collar bone would be turned into copper and he would find no means to kill him. So he would catch hold of him by his hand and feet and throw him (into the air) and the people would think as if he had been thrown in the Hell-Fire whereas he would be thrown in Paradise. Thereupon Allah's Messenger (ﷺ) said: He would be the most eminent amongst persons in regard to martyrdom in the eye of the Lord of the world.