‘Ali told that God's Messenger was presented with a she-mule which he rode, so ‘Ali said, “If we made asses cover mares we would have animals of this type,” to which God’s Messenger replied, “Only those who do not know do that.”
Hud b, ‘Abdallah b. Sa'd quoted his grandfather Mazida* as saying that on the day of the Conquest of Mecca God’s Messenger entered with gold and silver on his sword.
*i.e. on his mother’s side.
Tirmidhi transmitted it, saying this is a gharib tradition.
God’s Messenger was a servant under command who applied to us* only three things which he did not apply to the people in general. He ordered us to perform ablution fully, not to consume sadaqa, and not to make an ass cover a mare.