Imam Maalik مالك بن أنس بن مالك بن أبي عامر · The Book on the Two Eids

"Umar bin Al-Khattab asked Abu Waqid Al-Laithi what Allah's Messenger would recite during Al-Fitr and Al-Adha, so he said: 'He would recite: Qaf, By the Glorious Quran and the Hour has drawn near, and the moon has been cleft asunder.'"