Sahih al-Bukhari 2212
Narrated Hisham bin `Urwa from his father:
who heard Aisha saying, "The Holy Verse; 'Whoever amongst the guardians is rich, he should take no 
wages (from the property of the orphans) but If he is poor, let him have for himself what is just and 
reasonable (according to his labors)' (4.6) was revealed concerning the guardian of the orphans who 
looks after them and manages favorably their financial affairs; If the guardian Is poor, he could have 
from It what Is just and reasonable, (according to his labors).
حَدَّثَنِي إِسْحَاقُ، حَدَّثَنَا ابْنُ نُمَيْرٍ، أَخْبَرَنَا هِشَامٌ، وَحَدَّثَنِي مُحَمَّدٌ، قَالَ سَمِعْتُ عُثْمَانَ بْنَ فَرْقَدٍ، قَالَ سَمِعْتُ هِشَامَ بْنَ عُرْوَةَ، يُحَدِّثُ عَنْ أَبِيهِ، أَنَّهُ سَمِعَ عَائِشَةَ ـ رضى الله عنها ـ تَقُولُ ‏{‏وَمَنْ كَانَ غَنِيًّا فَلْيَسْتَعْفِفْ وَمَنْ كَانَ فَقِيرًا فَلْيَأْكُلْ بِالْمَعْرُوفِ‏}‏ أُنْزِلَتْ فِي وَالِي الْيَتِيمِ الَّذِي يُقِيمُ عَلَيْهِ، وَيُصْلِحُ فِي مَالِهِ، إِنْ كَانَ فَقِيرًا أَكَلَ مِنْهُ بِالْمَعْرُوفِ‏.‏