Musnad Ahmad 482:92

'Abd al-Rahman narrated to us, Musa—meaning Ibn 'Ali—narrated to us, from his father, from 'Uqbah ibn 'Amir, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Indeed, the Day of Sacrifice (Yawm al-Nahr), the Day of 'Arafah, and the Days of Tashriq are our festival, the people of Islam, and they are days of eating and drinking."