It was narrated that 'Ali bin Abu Talib said:
"I broke one of my forearms and I asked the Prophet about that. He told me to wipe over the bandages." (Maudu')Another chain with similar meaning. (JA)
English reference (JA): Vol. 1, Book 1, Hadith 657 (JA)
Arabic reference (JA): Book 1, Hadith 701 (JA)