(6) Zakat
كتاب الزكاة
(4a) Chapter: People to whom Sadaqa may not be given - Section 1
(3) باب من لا تحل له الصدقة - الفصل الأول
Mishkat al-Masabih 1824 
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.)
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
 مُتَّفَقٌ عَلَيْهِ  (الألباني)حكم :
Reference : Mishkat al-Masabih 1824
In-book reference : Book 6, Hadith 53