Musnad Ahmad 482:88

Waki' narrated to us, Musa ibn 'Ali narrated to us, from his father, who said: I heard 'Uqbah ibn 'Amir say: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The Day of 'Arafah, the Day of Sacrifice (Yawm al-Nahr), and the Days of Tashriq are our festival, the people of Islam, and they are days of eating and drinking."