Sahih al-Bukhari, Hadith 2777 ⓘ
Narrated Ibn `Umar: When `Umar founded an endowment he stipulated that its administrator could eat from it and also feed his friend on the condition that he would not store anything for himself from it.
حَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا حَمَّادٌ، عَنْ أَيُّوبَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ أَنَّ عُمَرَ، اشْتَرَطَ فِي وَقْفِهِ أَنْ يَأْكُلَ مَنْ وَلِيَهُ وَيُوكِلَ صَدِيقَهُ غَيْرَ مُتَمَوِّلٍ مَالاً.
also referenced under: Book 55, Hadith 40 (In-Book) & Volume 4, Book 51, Hadith 38 (USC-MSA)