Musnad Ahmad 1034:176

Waki’ narrated to us, Mis’ar narrated to us, from Wasil, from Abu Wa’il, from Hudhayfah, from the Prophet, peace and blessings of Allah be upon him. And from Hammad, from Ibrahim, from the Prophet, peace and blessings of Allah be upon him, the like of it: that he met the Prophet, peace and blessings of Allah be upon him, and he (the Prophet) turned away from him, then he (Hudhayfah) performed ghusl, then he came. He said: "The Muslim does not become impure."