Sahih Muslim 1071
Sahih Muslim · Book 12: The Book of Zakat · Zakat is forbidden for the messenger of Allah pbuh and his family, and they are Banu Hashim and Banu Al-Muttalib, and no one else
Anas b. Malik reported that the Messenger of Allah (ﷺ) found a date and said:
حَدَّثَنَا مُحَمَّدُ بْنُ الْمُثَنَّى ، وَابْنُ، بَشَّارٍ قَالاَ حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ ، حَدَّثَنِي أَبِي ، عَنْ قَتَادَةَ ، عَنْ أَنَسٍ ، أَنَّ النَّبِيَّ صلى الله عليه وسلم وَجَدَ تَمْرَةً فَقَالَ " لَوْلاَ أَنْ تَكُونَ صَدَقَةً لأَكَلْتُهَا " .
Were it not (that I fear) it may be part of sadaqa, I would have eaten it.