"Verily, those who unjustly eat up the property of orphans" -A man would have an orphan in his care, and he would keep his food, drink and vessels separate. This caused hardship to the Muslims, so Allah, the Mighty and Sublime, revealed: "And they ask you concerning orphans. Say: The best thing is to work honestly in their property, and if you mix your affairs with theirs, then they are your brothers" (in religion), so it is permissible for you to mix with them. (Using translation from Nasāʾī 3670)   

فِي قَوْلِهِ تَعَالَى {§إِنَّ الَّذِينَ يَأْكُلُونَ أَمْوَالَ الْيَتَامَى ظُلْمًا} [النساء 10] قَالَ كَانَ يَكُونُ فِي حَجْرِ الرَّجُلِ الْيَتِيمُ فَيَعْزِلُ لَهُ طَعَامَهُ وَشَرَابَهُ فَشَقَّ ذَلِكَ عَلَى الْمُسْلِمِينَ فَأَنْزَلَ اللهُ تَبَارَكَ وَتَعَالَى {وَإِنْ تُخَالِطُوهُمْ فَإِخْوَانُكُمْ} [البقرة 220] وَأَحَلَّ لَهُمْ خُلْطَتَهُمْ