He said, "Yahya ibn Yahya al-Laythi related to me from Malik ibnAnas from Ibn Shihab that one day Umar ibn Abdal-Aziz delayed theprayer. Urwa ibn az-Zubayr came and told him that al-Mughira ibn Shubahad delayed the prayer one day while he was in Kufa and Abu Masud al-Ansari had come to him and said, 'What's this, Mughira? Don't you knowthat the angel Jibril came down and prayed and the Messenger of Allah,may Allah bless him and grant him peace, prayed.' Then he prayedagain, and the Messenger of Allah, may Allah bless him and grant himpeace, prayed. Then he prayed again, and the Messenger of Allah, mayAllah bless him and grant him peace, prayed. Then he prayed again, andthe Messenger of Allah, may Allah bless him and grant him peace,prayed. Then he prayed again, and the Messenger of Allah, may Allahbless him and grant him peace, prayed. Then Jibril said, 'This is whatyou have been ordered to do.' Umar ibn Abd al-Aziz said, 'Be sure ofwhat you relate, Urwa. Was it definitely Jibril who established thetime of the prayer for the Messenger of Allah?' " Urwa said, "That'show it was related to Bashir ibn Abi Masud al-Ansari by his father."
Arabic/English book reference: Book 1, Hadith 1