Bayān ibn ‘Amr narrated to me, al-Naḍr narrated to us, Ibn ‘Awn informed us,
from Mujāhid, that he heard Ibn ‘Abbās (may Allāh be content with them both). They mentioned the Dajjāl to him — that between his eyes would be written “kāfir” (disbeliever), or the letters ك ف ر. He said: I did not hear that from him (i.e. the Prophet ﷺ), but he said: “As for Ibrāhīm (upon whom be peace), then look at your companion (meaning the Prophet ﷺ resembles him). And as for Mūsā (upon whom be peace), he was curly-haired and dark-complexioned, riding a red camel whose headgear was made with the fibre of date palm. It is as if I am looking at him descending into the 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 "
Reference: Sahih Al Bukhari 3355