Yahya related to me from Malik that he had heard that Umar ibn al-Khattab said, "Trade with the property of orphans and then it will not be eaten away by zakat."  

قَالَ اتَّجِرُوا فِي أَمْوَالِ الْيَتَامَى لاَ تَأْكُلُهَا الزَّكَاةُ  

Yahya related to me from Malik from Abd ar-Rahman ibn al-Qasim that his father said, ''A'isha used to look after me and one of my brothers - we were orphans - in her house, and she would take the zakat from our property."  

أَنَّهُ قَالَ كَانَتْ عَائِشَةُ تَلِينِي وَأَخًا لِي يَتِيمَيْنِ فِي حَجْرِهَا فَكَانَتْ تُخْرِجُ مِنْ أَمْوَالِنَا الزَّكَاةَ  

Yahya related to me from Malik that he had heard that A'isha, the wife of the Prophet ﷺ used to give the property of the orphans that were in her house to whoever would use it to trade with on their behalf.  

أَنَّ عَائِشَةَ زَوْجَ النَّبِيِّ ﷺ كَانَتْ تُعْطِي أَمْوَالَ الْيَتَامَى الَّذِينَ فِي حَجْرِهَا مَنْ يَتَّجِرُ لَهُمْ فِيهَا  

Yahya related to me from Malik that Yahya ibn Said bought some property on behalf of his brother's sons who were orphans in his house, and that that property was sold afterwards for a great deal of profit. Malik said, "There is no harm in using the property of orphans to trade with on their behalf if the one in charge of them has permission. Furthermore, I do not think that he is under any liability."  

أَنَّهُ اشْتَرَى لِبَنِي أَخِيهِ يَتَامَى فِي حَجْرِهِ مَالاً فَبِيعَ ذَلِكَ الْمَالُ بَعْدُ بِمَالٍ كَثِيرٍ قَالَ مَالِكٌ لاَ بَأْسَ بِالتِّجَارَةِ فِي أَمْوَالِ الْيَتَامَى لَهُمْ إِذَا كَانَ الْوَلِيُّ مَأْذُونًا فَلاَ أَرَى عَلَيْهِ ضَمَانًا