Mishkat al-Masabih #1703

‘Amr b. Shu'aib on his father’s authority said that his grandfather told of the Prophet addressing the people and saying, “If anyone is guardian of an orphan who owns property, he must trade with it and not leave it till the sadaqa consumes it." Tirmidhi transmitted it, adding that its isnad has been criticised because al-Muthanna b. as- Sabbah was weak.