Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
nasai:3670ʿAmr b. ʿAlī > ʿImrān b. ʿUyaynah > ʿAṭāʾ b. al-Sāʾib > Saʿīd b. Jubayr

"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.  

النسائي:٣٦٧٠أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا عِمْرَانُ بْنُ عُيَيْنَةَ قَالَ حَدَّثَنَا عَطَاءُ بْنُ السَّائِبِ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ

فِي قَوْلِهِ {إِنَّ الَّذِينَ يَأْكُلُونَ أَمْوَالَ الْيَتَامَى ظُلْمًا} قَالَ كَانَ يَكُونُ فِي حِجْرِ الرَّجُلِ الْيَتِيمَ فَيَعْزِلُ لَهُ طَعَامَهُ وَشَرَابَهُ وَآنِيَتَهُ فَشَقَّ ذَلِكَ عَلَى الْمُسْلِمِينَ فَأَنْزَلَ اللَّهُ ﷻ {وَإِنْ تُخَالِطُوهُمْ فَإِخْوَانُكُمْ} {فِي الدِّينِ} فَأَحَلَّ لَهُمْ خُلْطَتَهُمْ  


See similar narrations below:

Collected by Nasāʾī's Kubrá
nasai-kubra:6464ʿAmr b. ʿAlī > ʿImrān b. ʿUyaynah > ʿAṭāʾ b. al-Sāʾib > Saʿīd b. Jubayr

"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)   

الكبرى للنسائي:٦٤٦٤أَخْبَرَنَا عَمْرُو بْنُ عَلِيٍّ قَالَ حَدَّثَنَا عِمْرَانُ بْنُ عُيَيْنَةَ قَالَ حَدَّثَنَا عَطَاءُ بْنُ السَّائِبِ عَنْ سَعِيدِ بْنِ جُبَيْرٍ عَنِ ابْنِ عَبَّاسٍ

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