Muwatta Malik 592
موطأ مالك#592SahihThese are the words of a Successor — the generation after the Companions — not of the Prophet ﷺ.
وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، 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 .
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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 17:15