In the Book of Zakah and the Book of Sales it has already passed, as a mursal report from Yusuf bin Mahak (may Allah have mercy on him) from the Prophet (peace and blessings be upon him), and from Sayyiduna Umar bin al-Khattab (may Allah be pleased with him) as his own saying, that: "Seek (profit through trade) with the wealth of orphans, (lest) zakah consume it."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الوصايا / Q12675