The Messenger of Allah (May peace be upon him) came upon a date on the road; he would not take it for fear of being a part of the sadaqah. (Using translation from Abū Dāʾūd 1651)
كَانَ النَّبِيُّ ﷺ يَمُرُّ بِالتَّمْرَةِ فَمَا يَمْنَعُهُ مِنْ أَنْ يَأْخُذَهَا إِلَّا مَخَافَةُ أَنْ تَكُونَ مِنْ تَمْرِ الصَّدَقَةِ