Sahih Bukhari Volume 4, Book 61, Hadith 3498

حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ شُعْبَةَ، حَدَّثَنِي عَبْدُ الْمَلِكِ، عَنْ طَاوُسٍ، عَنِ ابْنِ عَبَّاسٍ ـ رضى الله عنهما – ‏{‏إِلاَّ الْمَوَدَّةَ فِي الْقُرْبَى‏}‏ قَالَ فَقَالَ سَعِيدُ بْنُ جُبَيْرٍ قُرْبَى مُحَمَّدٍ صلى الله عليه وسلم‏.‏ فَقَالَ إِنَّ النَّبِيَّ صلى الله عليه وسلم لَمْ يَكُنْ بَطْنٌ مِنْ قُرَيْشٍ إِلاَّ وَلَهُ فِيهِ قَرَابَةٌ، فَنَزَلَتْ عَلَيْهِ إِلاَّ أَنْ تَصِلُوا قَرَابَةً بَيْنِي وَبَيْنَكُمْ‏.‏

Narrated By Tawus : Ibn 'Abbas recited the Qur'anic Verse: 'Except to be kind to me for my kin-ship to you..." (42.23) Said bin Jubair said, "(The Verse implies) the kinship of Muhammad." Ibn 'Abbas said, "There was not a single house (i.e. sub-tribe) of Quraish but had a kinship to the Prophet and so the above Verse was revealed in this connection, and its interpretation is: 'O Quraish! You should keep good relation between me (i.e. Muhammad) and you."