Abu Dawud Book 4, Hadith Number 1959.
Chapter : Not known.
Narated By Az-Zuhri : Uthman offered complete prayer at Mina for the sake of bedouins who attended (hajj) in large numbers that year. He led the people four rak’ahs in prayer in order to teach them that the prayer (i.e. noon or afternoon prayer) essentially contained four rak’ahs.