Narrated 'Abdullah bin Abi A'ufa:

We were with Allah's Apostle on a journey, and when the sun set, he said to a man, "Get down and prepare a drink of Sawiq for me." The man said, "O Allah's Apostle! Will you wait till it is evening?" Allah's Apostle again said, "Get down and prepare a drink of Sawiq." The man said, "O Allah's Apostle! Will you wait till it is evening, for it is still daytime. " The Prophet again said, "Get down and prepare a drink of Sawiq." So the third time the man got down and prepared a drink of sawiq for him. Allah's Apostle drank thereof and pointed with his hand towards the East, saying, "When you see the night falling from this side, then a fasting person should break his fast."

حَدَّثَنَا عَلِيُّ بْنُ عَبْدِ اللَّهِ، حَدَّثَنَا جَرِيرُ بْنُ عَبْدِ الْحَمِيدِ، عَنْ أَبِي إِسْحَاقَ الشَّيْبَانِيِّ، عَنْ عَبْدِ اللَّهِ بْنِ أَبِي أَوْفَى، قَالَ كُنَّا فِي سَفَرٍ مَعَ رَسُولِ اللَّهِ ﷺ فَلَمَّا غَرَبَتِ الشَّمْسُ قَالَ لِرَجُلٍ " انْزِلْ فَاجْدَحْ لِي ". قَالَ يَا رَسُولَ اللَّهِ لَوْ أَمْسَيْتَ. ثُمَّ قَالَ " انْزِلْ فَاجْدَحْ ". قَالَ يَا رَسُولَ اللَّهِ لَوْ أَمْسَيْتَ إِنَّ عَلَيْكَ نَهَارًا. ثُمَّ قَالَ " انْزِلْ فَاجْدَحْ ". فَنَزَلَ فَجَدَحَ لَهُ فِي الثَّالِثَةِ، فَشَرِبَ رَسُولُ اللَّهِ ﷺ ثُمَّ أَوْمَأَ بِيَدِهِ إِلَى الْمَشْرِقِ فَقَالَ " إِذَا رَأَيْتُمُ اللَّيْلَ قَدْ أَقْبَلَ مِنْ هَا هُنَا فَقَدْ أَفْطَرَ الصَّائِمُ ".