"...But if he (the guardian) is poor, let him have for himself what is just and reasonable (according to his work). And when you release their property to them, take witness in their presence; and Allah is All-Sufficient in taking account." (V.4:6)

Sahih al-Bukhari · Book 65 · Hadith 4575

حَدَّثَنِي إِسْحَاقُ، أَخْبَرَنَا عَبْدُ اللَّهِ بْنُ نُمَيْرٍ، حَدَّثَنَا هِشَامٌ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ ـ رضى الله عنها ـ فِي قَوْلِهِ تَعَالَى ‏{‏وَمَنْ كَانَ غَنِيًّا فَلْيَسْتَعْفِفْ وَمَنْ كَانَ فَقِيرًا فَلْيَأْكُلْ بِالْمَعْرُوفِ‏}‏ أَنَّهَا نَزَلَتْ فِي مَالِ الْيَتِيمِ إِذَا كَانَ فَقِيرًا، أَنَّهُ يَأْكُلُ مِنْهُ مَكَانَ قِيَامِهِ عَلَيْهِ،…

Narrated Aisha: regarding the Statement of Allah: "And whoever amongst the guardian is rich, he should take no wages, but if he is poor, let him have for himself what is just and reasonable (according to his work). This…