Sahih Muslim , Book 5, Hadith 2344 (USC-MSA) ⓘ
Anas b. Malik reported that the Messenger of Allah found a date in the street and said: If it were not of sadaqa I would have eaten it.
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا وَكِيعٌ، عَنْ سُفْيَانَ، عَنْ مَنْصُورٍ، عَنْ طَلْحَةَ بْنِ مُصَرِّفٍ، عَنْ أَنَسِ بْنِ مَالِكٍ، أَنَّ النَّبِيَّ صلى الله عليه وسلم وَجَدَ تَمْرَةً فَقَالَ " لَوْلاَ أَنْ تَكُونَ مِنَ الصَّدَقَةِ لأَكَلْتُهَا " .
also referenced under: Book 12, Hadith 215 (In-Book) & Hadith 1071 (Reference)