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.
Safwan b. ‘Assal said, “God’s messenger used to command us, when we were travelling, not to take off our shoes for three days and nights except for seminal defilement, and not to do so on account of easing ourselves, passing water, or sleeping.”