Musnad Ahmad 949:11

Abu al-Nadr narrated to us, Hashraj narrated to us, Sa'id ibn Jumhan narrated to me, from Safinah, the freed slave of the Messenger of Allah, may Allah bless him and grant him peace, who said: The Messenger of Allah, may Allah bless him and grant him peace, delivered a sermon to us and said: "Behold, there was no prophet before me but that he warned his nation about the Dajjal. He is blind in his left eye, and over his right eye is a thick film. Written between his eyes is 'Kafir' (disbeliever). There will emerge with him two valleys: one of them is a Paradise and the other is a Fire; so his Fire is a Paradise and his Paradise is a Fire. With him will be two angels from among the angels, resembling two of the prophets—if I wished, I could name them by their names and the names of their fathers—one of them on his right and the other on his left, and that is a trial. The Dajjal will say: 'Am I not your Lord? Do I not give life and cause death?' One of the two angels will say to him: 'You have lied.' No one among the people hears him except his companion. Then he (the Dajjal) will say to him: 'You have spoken the truth.' The people will hear him and think that he is only confirming the Dajjal, and that is a trial. Then he will travel until he comes to Medina, but he will not be permitted to enter it. He will say: 'This is the town of that man.' Then he will travel until he comes to Ash-Sham, where Allah will destroy him at the pass of Afiq."