Yusuf bin Mahak (may Allah have mercy on him) narrates that the Messenger of Allah (peace and blessings be upon him) said: "Increase the wealth of the orphan — or he said: of the orphans — so that zakah does not consume it or finish it off."
This report is mursal, except that al-Shafi'i (may Allah have mercy on him) supported it by citing the previous report and what has been narrated from the Companions on this matter; it has also been narrated from Amr bin Shu'ayb, from his father, from his grandfather, as marfu' (from the Prophet).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7338