وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، أَنَّهُ قَالَ أُنْزِلَتْ ‏{‏عَبَسَ وَتَوَلَّى‏}‏ فِي عَبْدِ اللَّهِ بْنِ أُمِّ مَكْتُومٍ جَاءَ إِلَى رَسُولِ اللَّهِ صلى الله عليه وسلم فَجَعَلَ يَقُولُ يَا مُحَمَّدُ اسْتَدْنِينِي وَعِنْدَ النَّبِيِّ صلى الله عليه وسلم رَجُلٌ مِنْ عُظَمَاءِ الْمُشْرِكِينَ فَجَعَلَ النَّبِيُّ صلى الله عليه وسلم يُعْرِضُ عَنْهُ وَيُقْبِلُ عَلَى الآخَرِ وَيَقُولُ ‏"‏ يَا أَبَا فُلاَنٍ هَلْ تَرَى بِمَا أَقُولُ بَأْسًا ‏"‏ ‏.‏ فَيَقُولُ لاَ وَالدِّمَاءِ مَا أَرَى بِمَا تَقُولُ بَأْسًا ‏.‏ فَأُنْزِلَتْ ‏{‏عَبَسَ وَتَوَلَّى أَنْ جَاءَهُ الأَعْمَى‏}‏

Yahya related to me from Malik from Hisham ibn Urwa that hisfather said that Abasa (Sura 80) was sent down about Abdullah ibn UmmMaktum. He came to the Prophet, may Allah bless him and grant himpeace, and began to say, "O Muhammad, show me a place near you (whereI can sit)," whilst one of the leading men of the idol worshippers wasin audience with the Prophet, may Allah bless him and grant him peace.The Prophet, may Allah bless him and grant him peace, began to turnaway from him and give his attention to the other man, and he said tohim, "Father of so-and-so, do you see any harm in what I am saying?"and he said, "No, by the blood (of our sacrifices) I see no harm inwhat you are saying." And Abasa - "He frowned and turned away whenthe blind man came" - was sent down. Translation Not Available

Book Ref: Muwatta Imam Malik Book 15 Hadith 480
Web Ref:  Muwatta Imam Malik Book 15 Hadith 8