Sahih al-Bukhari 3489
Sahih al-Bukhari · Book 61: Virtues and Merits of the Prophet (pbuh) and his Companions · The Statement of Allah Ta'ala: "O mankind! We have created you from a male and female."
Narrated Ibn `Abbas:
حَدَّثَنَا خَالِدُ بْنُ يَزِيدَ الْكَاهِلِيُّ ، حَدَّثَنَا أَبُو بَكْرٍ ، عَنْ أَبِي حَصِينٍ ، عَنْ سَعِيدِ بْنِ جُبَيْرٍ ، عَنِ ابْنِ عَبَّاسِ ، رضى الله عنهما. {وَجَعَلْنَاكُمْ شُعُوبًا وَقَبَائِلَ} قَالَ الشُّعُوبُ الْقَبَائِلُ الْعِظَامُ، وَالْقَبَائِلُ الْبُطُونُ.
Regarding the Verse: 'And (We) made you into Shu'ub and Qabail-- (49.13) that Shu'uib means the big Qabail (i.e. nations) while the Qabail (i.e. tribes) means the branch tribes.