We were with the Messenger of Allah ﷺ on a journey during the month of Ramadan. When the sun had set, he said, "Get down, so-and-so, and mix some sawiq for us."The man replied, "Messenger of Allah, there is still daylight."He said, "Get down and mix it."So he did, and handed it to him, and the Prophet drank. After drinking, he gestured with his hand toward the west and said, "When the sun has set on this side and night has come from that side, the fasting person has broken his fast."
حدثنا هشيم أخبرنا الشيباني
كنا مع رسول الله ﷺ في سفر في شهر رمضان فلما غابت الشمس قال انزل يا فلان فاجدح لنا قال يا رسول الله عليك نهار قال انزل فاجدح قال ففعل فناوله فشرب فلما شرب أومأ بيده إلى المغرب فقال إذا غربت الشمس هاهنا جاء الليل من هاهنا فقد أفطر الصائم
Its isnad is sahih, its narrators are trustworthy and well known, and the hadith was narrated by Bukhari 4/198, no. 1957 Fath, Muslim 2/772, no. 1098, Abu Dawud 2/305, no. 2352, Tirmidhi 3/72, no. 698, who said it is hasan sahih, Darimi 2/13, no. 1700, and Ibn Majah 1/541, no. 1697.