Hasan al-Urani (may Allah have mercy on him) said that a man said: "O Messenger of Allah (peace and blessings be upon him)! For what may I strike the orphan in my care?" He (peace and blessings be upon him) said: "For whatever you would strike your own children." The man then said: "May I take something from his wealth?" He (peace and blessings be upon him) said: "You may take it on the condition that you do not increase your own wealth by it, nor protect your own wealth by means of it."
This is mursal.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب البيوع / 10994