Musnad Ahmad 980:15

I read to Abd al-Rahman: Malik ibn Anas, from Ibn Shihab al-Zuhri, that Umar ibn Abd al-Aziz delayed the prayer one day, so Urwah ibn al-Zubayr entered upon him and informed him that al-Mughirah ibn Shu'bah delayed the prayer one day while he was in Kufa. Abu Mas'ud al-Ansari entered upon him and said: "What is this, O Mughirah? Do you not know that Gabriel descended and prayed, and the Messenger of Allah (ﷺ) prayed; then he prayed, and the Messenger of Allah (ﷺ) prayed; then he said: 'With this I have been commanded'?" Umar said to Urwah ibn al-Zubayr: "Be certain of what you are narrating, O Urwah, or is it that Gabriel is the one who established the time of prayer for the Messenger of Allah (ﷺ)?" Urwah said: "That is how Bashir ibn Abi Mas'ud used to narrate from his father."