A man came to the Prophet ﷺ and said, "I have nothing, and I have no wealth of my own, but I am the guardian of an orphan who has wealth."The Prophet ﷺ said, "Eat from the wealth of your orphan without extravagance and without amassing wealth from it." And I think he also said, "And do not protect your own wealth by using his."
حدثنا أحمد بن الأزهر حدثنا روح بن عبادة حدثنا حسين المعلم
جاء رجل إلى النبي ﷺ فقال لا أجد شيئا وليس لي مال ولي يتيم له مال قال كل من مال يتيمك غير مسرف ولا متأثل مالا قال وأحسبه قال ولا تقي مالك بماله
[Its chain is hasan]. Abu Dawud narrated it in the Wills, chapter on what the guardian of an orphan may take from the orphan's wealth, no. 2872, from the hadith of Husayn Muallim, through him, and Ibn Khuzayma and Ibn Jarud graded it sahih, no. 952, and Hafiz said in Fath al-Bari 8/241, its chain is strong.