Musnad Ahmad 799:84

Yazid ibn Harun narrated to us, Mas'udi informed us, and Abu Nu'aym narrated to us, Mas'udi narrated to us, from Ma'bad ibn Khalid, from Zayd ibn 'Uqbah, from Samurah ibn Jundub, who said: "The Messenger of Allah, may Allah bless him and grant him peace, used to recite in the two Eids: 'Glorify the name of your Lord, the Most High' (Surah Al-A'la), and 'Has there reached you the report of the Overwhelming?' (Surah Al-Ghashiyah)."