Sahih al-Bukhari 1941

Ali bin Abdullah narrated to us: Sufyan narrated to us, from Abu Ishaq al-Shaybani, who heard Ibn Abi Awfa, may Allah be pleased with him, say: We were with the Messenger of Allah, peace and blessings be upon him, on a journey. He said to a man: Get down and mix a drink of grain meal for me. The man said: Messenger of Allah, the sun is still visible. He repeated: Get down and mix a drink for me. The man again said: Messenger of Allah, the sun is still visible. He said a third time: Get down and mix a drink for me. So the man got down, prepared it for him, and he drank. Then he gestured with his hand over there and said: When you see night approaching from that direction, the fasting person may break his fast. Jarir and Abu Bakr bin Ayyash also narrated it from al-Shaybani, from Ibn Abi Awfa, who said: I was with the Prophet, peace and blessings be upon him, on a journey.