Sahih Bukhari Volume 5, Book 64, Hadith 4009

حَدَّثَنَا أَبُو الْيَمَانِ، أَخْبَرَنَا شُعَيْبٌ، عَنِ الزُّهْرِيِّ، سَمِعْتُ عُرْوَةَ بْنَ الزُّبَيْرِ، يُحَدِّثُ عُمَرَ بْنَ عَبْدِ الْعَزِيزِ فِي إِمَارَتِهِ أَخَّرَ الْمُغِيرَةُ بْنُ شُعْبَةَ الْعَصْرَ وَهْوَ أَمِيرُ الْكُوفَةِ، فَدَخَلَ أَبُو مَسْعُودٍ عُقْبَةُ بْنُ عَمْرٍو الأَنْصَارِيُّ جَدُّ زَيْدِ بْنِ حَسَنٍ شَهِدَ بَدْرًا فَقَالَ لَقَدْ عَلِمْتَ نَزَلَ جِبْرِيلُ فَصَلَّى فَصَلَّى رَسُولُ اللَّهِ صلى الله عليه وسلم خَمْسَ صَلَوَاتٍ ثُمَّ قَالَ هَكَذَا أُمِرْتَ‏.‏ كَذَلِكَ كَانَ بَشِيرُ بْنُ أَبِي مَسْعُودٍ يُحَدِّثُ عَنْ أَبِيهِ‏

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. 'Uqba bin 'Amr Al-Ansari, the grand-father of Zaid bin Hasan, who was one of the Badr warriors, came in and said, (to Al-Mughira), 'You know that Gabriel came down and offered the prayer and Allah's Apostle prayed five prescribed prayers, and Gabriel said (to the Prophet), "I have been ordered to do so (i.e. offer these five prayers at these fixed stated hours of the day)."