Sahih Bukhari · Hadith 4966
Prophetic Commentary on the Qur'an (Tafseer of the Prophet (pbuh)) - كتاب التفسير
حدثنا محمود، حدثنا عبيد الله، عن إسرائيل، عن أبي حصين، عن مجاهد، عن ابن عباس رضى الله عنهما {عتل بعد ذلك زنيم} قال رجل من قريش له زنمة مثل زنمة الشاة.
Narrated Ibn `Abbas: (regarding the Verse):-- 'Cruel after all that, base-born (of illegitimate birth).' (68.13) It was revealed in connection with a man from Quaraish who had a notable sign (Zanamah) similar to the notable sign which usually-hung on the neck of a sheep (to recognize it).
Gradings are classical jarḥ-wa-taʿdīl, name-matched to a rijāl index (not individually re-verified).