Sahih al-Bukhari 2210
Sahih al-Bukhari · Book 34: Sales and Trade · Where there is no fixed judgement, the traditions and conventions of community are to be referred
Narrated Anas bin Malik:
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ ، أَخْبَرَنَا مَالِكٌ ، عَنْ حُمَيْدٍ الطَّوِيلِ ، عَنْ أَنَسِ بْنِ مَالِكٍ ـ رضى الله عنه ـ قَالَ حَجَمَ رَسُولَ اللَّهِ صلى الله عليه وسلم أَبُو طَيْبَةَ، فَأَمَرَ لَهُ رَسُولُ اللَّهِ صلى الله عليه وسلم بِصَاعٍ مِنْ تَمْرٍ، وَأَمَرَ أَهْلَهُ أَنْ يُخَفِّفُوا عَنْهُ مِنْ خَرَاجِهِ.
Abu Taiba cupped Allah's Messenger (ﷺ) and so Allah's Messenger (ﷺ) ordered that a Sa of dates be paid to him and ordered his masters (for he was a slave) to reduce his tax.