Yahya related to me from Malik that Yahya ibn Said bought someproperty on behalf of his brother's sons who were orphans in hishouse, and that that property was sold afterwards for a great deal ofprofit.Malik said, "There is no harm in using the propertyof orphans to trade with on their behalf if the one in charge of themhas permission. Furthermore, I do not think that he is under anyliability."
USC-MSA web (English) reference: Book 17, Hadith 15
Arabic reference: Book 17, Hadith 595