حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ ضَمْرَةَ بْنِ سَعِيدٍ الْمَازِنِيِّ، عَنْ عُبَيْدِ اللَّهِ بْنِ عَبْدِ اللَّهِ بْنِ عُتْبَةَ بْنِ مَسْعُودٍ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، سَأَلَ أَبَا وَاقِدٍ اللَّيْثِيَّ مَا كَانَ يَقْرَأُ بِهِ رَسُولُ اللَّهِ صلى الله عليه وسلم فِي الأَضْحَى وَالْفِطْرِ فَقَالَ كَانَ يَقْرَأُ بِـ ‏{‏ق وَالْقُرْآنِ الْمَجِيدِ‏}‏ وَ ‏{‏اقْتَرَبَتِ السَّاعَةُ وَانْشَقَّ الْقَمَرُ‏}‏‏.‏

Yahya related to me from Malik from Damra ibn Said al-Mazini fromUbaydullah ibn Abdullah ibn Utba ibn Masud that Umar ibn al-Khattabasked Abu Waqid al-Laythi what the Messenger of Allah, may Allah blesshim and grant him peace, used to recite in the prayers of Adha andFitr. He said, "He used to recite Qaf (Sura 50) and al-lnshiqaq(Sura84)." Translation Not Available

Book Ref: Muwatta Imam Malik Book 10 Hadith 438
Web Ref:  Muwatta Imam Malik Book 10 Hadith 8