Musnad Ahmad Hadith 19395

It is narrated from Abdullah bin Abi Awfa (may Allah be pleased with him) that once we were with the Noble Prophet (ﷺ) on a journey in the month of Ramadan. When the sun had set, the Noble Prophet (ﷺ) ordered someone, "O so-and-so! Get down and mix sattu (barley drink) for us." He said, "O Messenger of Allah! There is still some part of the day left." The Noble Prophet (ﷺ) again told him, "Get down and mix sattu." So he acted upon this. The Noble Prophet (ﷺ) took the vessel in his hand and drank from it. After that, pointing with his hand towards the west, he said, "When the sun sets here and the night comes from here, then the fasting person should break his fast."