Sahih Muslim Book 4, Hadith Number 1936.

Chapter : What is to be recited In Id Prayers.

‘Abdullah b. ‘Umar reported that (his father) ‘Umar b. Khattab asked Abu Waqid al-Laithi what the Messenger of Allah (may peace be upon him) used to recite on ‘Id-ul-Adha and ‘Id-ul-Fitr. He said: He used to recite in them: “Qaf. By the Glorious Qur’an” (Surah 1), “The Hour drew near, and the moon was rent asunder” (Surah liv.).