Sahih Bukhari Volume 2, Book 26, Hadith Number 626.

Narated By Mujahid : I was in the company of Ibn Abbas and the people talked about Ad-Dajjal and said, “Ad-Dajjal will come with the word Kafir (non-believer) written in between his eyes.” On that Ibn Abbas said, “I have not heard this from the Prophet but I heard him saying, ‘As if I saw Moses just now entering the valley reciting Talbyia.'”