Sahih Muslim Book - 12, Hadith - 2491

حَدَّثَنَا عَبْدُ الرَّحْمَنِ بْنُ سَلاَّمٍ الْجُمَحِىُّ حَدَّثَنَا الرَّبِيعُ - يَعْنِى ابْنَ مُسْلِمٍ - عَنْ مُحَمَّدٍ - وَهُوَ ابْنُ زِيَادٍ - عَنْ أَبِى هُرَيْرَةَ. أَنَّ النَّبِىَّ -صلى الله عليه وسلم- كَانَ إِذَا أُتِىَ بِطَعَامٍ سَأَلَ عَنْهُ فَإِنْ قِيلَ هَدِيَّةٌ أَكَلَ مِنْهَا وَإِنْ قِيلَ صَدَقَةٌ لَمْ يَأْكُلْ مِنْهَا.

It was narrated from Abu Hurairah that when food was brought to the Prophet (SAW), he would ask about it. If it was said that it was a gift, he would eat from it, but if it was said that it was charity, he would not eat from it.