Sahih al-Bukhari, Hadith 1958 ⓘ
Narrated Ibn Abi `Aufa: I was with the Prophet on a journey, and he observed the fast till evening. The Prophet said to a man, "Get down and mix Sawiq with water for me." He replied, "Will you wait till it is evening?" The Prophet said, "Get down and mix Sawiq with water for me; when you see night falling from this side, the fasting person should break his fast."
حَدَّثَنَا أَحْمَدُ بْنُ يُونُسَ، حَدَّثَنَا أَبُو بَكْرٍ، عَنْ سُلَيْمَانَ، عَنِ ابْنِ أَبِي أَوْفَى ـ رضى الله عنه ـ قَالَ كُنْتُ مَعَ النَّبِيِّ صلى الله عليه وسلم فِي سَفَرٍ، فَصَامَ حَتَّى أَمْسَى، قَالَ لِرَجُلٍ " انْزِلْ، فَاجْدَحْ لِي ". قَالَ لَوِ انْتَظَرْتَ حَتَّى تُمْسِيَ. قَالَ " انْزِلْ، فَاجْدَحْ لِي، إِذَا رَأَيْتَ اللَّيْلَ قَدْ أَقْبَلَ مِنْ هَا هُنَا فَقَدْ أَفْطَرَ الصَّائِمُ ".
also referenced under: Book 30, Hadith 65 (In-Book) & Volume 3, Book 31, Hadith 179 (USC-MSA)