Jami' at-Tirmidhi
Jami` at-Tirmidhi 2245
حَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا مُحَمَّدُ بْنُ جَعْفَرٍ، حَدَّثَنَا شُعْبَةُ، عَنْ قَتَادَةَ، قَالَ سَمِعْتُ أَنَسًا، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " مَا مِنْ نَبِيٍّ إِلاَّ وَقَدْ أَنْذَرَ أُمَّتَهُ الأَعْوَرَ الْكَذَّابَ أَلاَ إِنَّهُ أَعْوَرُ وَإِنَّ رَبَّكُمْ لَيْسَ بِأَعْوَرَ مَكْتُوبٌ بَيْنَ عَيْنَيْهِ ك ف ر " . هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Unreviewed translation. All hadiths in this collection are available in five languages. Titles and introductions may remain in Arabic.
Muḥammad ibn Bashshār narrated to us; Muḥammad ibn Ja‘far narrated to us; Shu‘bah narrated to us, from Qatādah, who said: I heard Anas say that the Messenger of Allah said: “Every prophet warned his community about the one-eyed impostor. Take note: he is one-eyed, while your Lord is not one-eyed. The letters K-F-R are written between his eyes.”
This is a ḥasan ṣaḥīḥ hadith.
Notes and open questions — unreviewed
The source writes the letters kāf, fā’, and rā’ separately between the Dajjāl’s eyes; the letter sequence is represented as K-F-R.