Sunan Abi Da'ud · Hadith 4317

حدثنا محمد بن المثنى، عن محمد بن جعفر، عن شعبة، ك ف ر ‏.‏

Shu’bah said in his version: “the letters k, f, r” (are on his forehead).

Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).