Musnad Ahmad 5:259

Yahya ibn Ghaylan narrated to us, Al-Mufaddal ibn Fadala narrated to us, Yazid ibn Abdullah narrated to me, from Abdullah ibn Abi Salama, from Amr ibn Sulaym al-Zuraqi, from his mother, who said: We were in Mina, when a caller called out: "Behold, the Messenger of Allah, may Allah bless him and grant him peace, says: 'Do not fast, for they are days of eating and drinking.'" She said: So I lifted the ropes of the tent, and behold, the caller was Ali ibn Abi Talib.