Umar bin Khattab asked Abu Waqid al-Laythi what the Messenger of Allah ﷺ used to recite during the prayers of Eid al-Adha and Eid al-Fitr.He replied, "He would recite in both of them 'Qaf. By the glorious Quran' [Qaf 50:1] and 'The Hour has drawn near, and the moon has split' [Qamar 54:1]."
حدثنا القعنبي عن مالك عن ضمرة بن سعيد المازني
أن عمر بن الخطاب سأل أبا واقد الليثي ماذا كان يقرأ به رسول الله ﷺ في الأضحى والفطر قال كان يقرأ فيهما ق والقرآن المجيد واقتربت الساعة وانشق القمر
Muslim narrated it in the Book of the Two Eid Prayers, chapter on what is recited in the two Eid prayers, hadith no. 891, from the hadith of Malik, through this same chain, and it is found in Muwatta (Yahya's version) 1/180.