"Cruel, and moreover base-born (of illegitimate birth) ." (V.68:13)
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).
Reference
Sahih al-Bukhari 4917
In-book reference
Book 65, Hadith 437
USC-MSA web (English)
Vol. 6, Book 60, Hadith 439
Translation by Dr. M. Muhsin Khan · Language: EN
Sahih
Arabic Text
حَدَّثَنَا مَحْمُودٌ، حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ إِسْرَائِيلَ، عَنْ أَبِي حَصِينٍ، عَنْ مُجَاهِدٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما ـ {عُتُلٍّ بَعْدَ ذَلِكَ زَنِيمٍ} قَالَ رَجُلٌ مِنْ قُرَيْشٍ لَهُ زَنَمَةٌ مِثْلُ زَنَمَةِ الشَّاةِ.