From Sahih Bukhari (Hadith 5913):
Narrated Mujahid:We were with Ibn `Abbas and the people mentioned Ad-Dajjal. Someone said, "The word 'Kafir' (unbeliever) is written in between his (Ad-Dajjal's) eyes." Ibn `Abbas said, "I have not heard the Prophet saying this, but he said, 'As regards Abraham, he looks like your companion (i.e. the Prophet, Muhammad), and as regards Moses, he is a brown curly haired man riding a camel and reigned with a strong jute rope, as if I am now looking at him getting down in the valley and saying, "Labbaik
Reference: Bukhari 5913