Sahih Muslim 2933
Sahih Muslim · Book 54: The Book of Tribulations and Portents of the Last Hour · Ad-Dajjal
Anas b. Malik reported that Allah's Messenger (ﷺ) said:
وَحَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ ، حَدَّثَنَا عَفَّانُ ، حَدَّثَنَا عَبْدُ الْوَارِثِ ، عَنْ شُعَيْبِ بْنِ الْحَبْحَابِ ، عَنْ أَنَسِ بْنِ مَالِكٍ ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " الدَّجَّالُ مَمْسُوحُ الْعَيْنِ مَكْتُوبٌ بَيْنَ عَيْنَيْهِ كَافِرٌ " . ثُمَّ تَهَجَّاهَا ك ف ر " يَقْرَؤُهُ كُلُّ مُسْلِمٍ " .
Dajjal is blind of one eye and there is written between his eyes the word" Kafir". He then spelled the word as k. f. r., which every Muslim would be able to read.