Mishkat al-Masabih #482

Al-Mughira b. Shu'ba said, “I assisted the Prophet to perform ablution on the expedition to Tabuk, and he wiped the top and bottom of the shoe.” Abu Dawud, Tirmidhi and Ibn Majah transmitted it. Tirmidhi said, “This is a weak tradition. I asked Abu Zur'a and Muhammad, i.e. Bukhari, about this tradition and they said that it is not sound.” Abu Dawud also declared it to be weak.