Language:
كتاب الملاحم
39  
Battles (Kitab Al-Malahim)
(1600)
Chapter: The appearance of the Dajjal
(14)
باب خُرُوجِ الدَّجَّالِ
Sunan Abi Dawud 4317
Shu’bah said in his version:
“the letters k, f, r” (are on his forehead).
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى، عَنْ مُحَمَّدِ بْنِ جَعْفَرٍ، عَنْ شُعْبَةَ، ك ف ر ‏.‏
Reference : Sunan Abi Dawud 4317
In-book reference : Book 39, Hadith 27
English translation : Book 38, Hadith 4303