Sahih al-Bukhari, Hadith 3355 ⓘ

Narrated Mujahid: That when the people mentioned before Ibn `Abbas that the Dajjal would have the word Kafir, (i.e. unbeliever) or the letters Kafir (the root of the Arabic verb 'disbelieve') written on his forehead, I heard Ibn `Abbas saying, "I did not hear this, but the Prophet said, 'If you want to see Abraham, then look at your companion (i.e. the Prophet) but Moses was a curly-haired, brown man (who used to ride) a red camel, the reins of which was made of fires of date-palms. As if I were now looking down a valley."

حَدَّثَنِي بَيَانُ بْنُ عَمْرٍو، حَدَّثَنَا النَّضْرُ، أَخْبَرَنَا ابْنُ عَوْنٍ، عَنْ مُجَاهِدٍ، أَنَّهُ سَمِعَ ابْنَ عَبَّاسٍ ـ رضى الله عنهما ـ وَذَكَرُوا لَهُ الدَّجَّالَ بَيْنَ عَيْنَيْهِ مَكْتُوبٌ كَافِرٌ أَوْ ك ف ر‏.‏ قَالَ لَمْ أَسْمَعْهُ وَلَكِنَّهُ قَالَ ‏ "‏ أَمَّا إِبْرَاهِيمُ فَانْظُرُوا إِلَى صَاحِبِكُمْ، وَأَمَّا مُوسَى فَجَعْدٌ آدَمُ عَلَى جَمَلٍ أَحْمَرَ مَخْطُومٍ بِخُلْبَةٍ، كَأَنِّي أَنْظُرُ إِلَيْهِ انْحَدَرَ فِي الْوَادِي ‏" ‏‏.‏