Sunan Abi Dawud 2352
Narrated 'Abd Allah b. Abi Awfa:
We went along with the Messenger of Allah (ﷺ) while he was fasting. When the sun set, he said to Bilal: Bilal, come down and prepare barley beverage for us. He said: Messenger of Allah, would  that you waited for the evening. He said: Come down and prepare barley beverage for us. He said: Messenger of Allah, the say still remains on you (i.e. there remains the brightness of the day). He said: Come down and prepare barley drink for us. So he came down and prepared barley drink. The Messenger of Allah (ﷺ) drank it and said: When you see that the night approaches from this side, he who fasts has reached the time to break it ; and he pointed to the east with his finger.
حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا عَبْدُ الْوَاحِدِ، حَدَّثَنَا سُلَيْمَانُ الشَّيْبَانِيُّ، قَالَ سَمِعْتُ عَبْدَ اللَّهِ بْنَ أَبِي أَوْفَى، يَقُولُ سِرْنَا مَعَ رَسُولِ اللَّهِ صلى الله عليه وسلم وَهُوَ صَائِمٌ فَلَمَّا غَرَبَتِ الشَّمْسُ قَالَ ‏"‏ يَا بِلاَلُ انْزِلْ فَاجْدَحْ لَنَا ‏"‏ ‏.‏ قَالَ يَا رَسُولَ اللَّهِ لَوْ أَمْسَيْتَ ‏.‏ قَالَ ‏"‏ انْزِلْ فَاجْدَحْ لَنَا ‏"‏ ‏.‏ قَالَ يَا رَسُولَ اللَّهِ إِنَّ عَلَيْكَ نَهَارًا ‏.‏ قَالَ ‏"‏ انْزِلْ فَاجْدَحْ لَنَا ‏"‏ ‏.‏ فَنَزَلَ فَجَدَحَ فَشَرِبَ رَسُولُ اللَّهِ صلى الله عليه وسلم ثُمَّ قَالَ ‏"‏ إِذَا رَأَيْتُمُ اللَّيْلَ قَدْ أَقْبَلَ مِنْ هَا هُنَا فَقَدْ أَفْطَرَ الصَّائِمُ ‏"‏ ‏.‏ وَأَشَارَ بِأُصْبُعِهِ قِبَلَ الْمَشْرِقِ ‏.‏