Musnad Ahmad 8:62

Muhammad ibn Bakr narrated to us, Muhammad ibn Abi Humayd informed us, Isma'il ibn Muhammad ibn Sa'd ibn Abi Waqqas informed me, from his father, from his grandfather, who said: The Messenger of Allah, peace and blessings of Allah be upon him, said to me: "O Sa'd, stand up and announce in Mina that these are days of eating and drinking, and there is no fasting in them."