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Surah 2. Al-Baqara
Ayah 220
220فِى ٱلدُّنْيَا وَٱلْـَٔاخِرَةِ ۗ وَيَسْـَٔلُونَكَ عَنِ ٱلْيَتَـٰمَىٰ ۖ قُلْ إِصْلَاحٌ لَّهُمْ خَيْرٌ ۖ وَإِن تُخَالِطُوهُمْ فَإِخْوَٰنُكُمْ ۚ وَٱللَّهُ يَعْلَمُ ٱلْمُفْسِدَ مِنَ ٱلْمُصْلِحِ ۚ وَلَوْ شَآءَ ٱللَّهُ لَأَعْنَتَكُمْ ۚ إِنَّ ٱللَّهَ عَزِيزٌ حَكِيمٌ
[220] And they ask"What ought we to spend (in the way of Allah)"? Say"Spend whatever you can spare." Thus Allah makes His commands clear to you so that you may think about the good of both this world and the Hereafter. They ask you about the right way of dealing with orphans. Say "The right way is that which is for their good."236 Then there is no harm if you live a common life with them for they are after all your own brethren. Allah knows well the one who means harm and also the one who means good. If Allah had willed He would have been hard upon you in this matter for He is All-Powerful but He is at the same time All-Wise.
236Before the revelation of this verse, very strict warnings had been administered for the preservation of the rights of orphans. Warnings like "those who misappropriate the property of orphans fill their bellies with fire," had made the Muslims so fearful that the guardians of the orphans had made separate arrangements for their meals etc. But, inspite of all this, they feared lest any part of the property of the orphans should get mixed up with their property and they should incur the wrath of Allah. That is why they asked the Holy Prophet to define for them the limits of their relations with orphans. They have been told to do sincerely what is best in their interest and at the same time warned that Allah knows everything.