Sahih Bukhari Volume 5, Book 59, Hadith Number 344.
Narrated By Az-Zuhri: I heard ‘Urwa bin Az-Zubair talking to ‘Umar bin ‘Abdul ‘Aziz during the latter’s Governorship (at Medina), he said, “Al-Mughira bin Shu’ba delayed the ‘Asr prayer when he was the ruler of Al-Kufa. On that, Abu Mas’ud.…