I was with the Prophet ﷺ on a journey, and he observed the fast till evening. The Prophet ﷺ 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."
كُنْتُ مَعَ النَّبِيِّ ﷺ 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