Mishkat al-Masabih 6 Zakat كتاب الزكاة 53

وَعَنْ أَبِي هُرَيْرَةَ قَالَ: كَانَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ إِذَا أُتِيَ بِطَعَامٍ سَأَلَ عَنْهُ: «أَهَدْيَةٌ أَمْ صَدَقَةٌ؟» فَإِنْ قِيلَ: صَدَقَةٌ: قَالَ لِأَصْحَابِهِ: «كُلُوا» وَلَمْ يَأْكُلْ وَإِنْ قِيلَ: هَدِيَّةٌ ضَرَبَ بِيَدِهِ فَأَكَلَ مَعَهم

Abu Huraira said that when God’s messenger was brought food he asked whether it was a present or sadaqa , and if he was informed that it was sadaqa he told his companions to eat, but did not eat himself; if however he was informed that it was a present he put in his hand and ate along with them. (Bukhari and Muslim.)