When the night approaches and the day retreates and the sun sinks down, then the observer of the fast should break it. Ibn Numair made no mention of the word" then".  

قَالَ رَسُولُ اللَّهِ ﷺ إِذَا أَقْبَلَ اللَّيْلُ وَأَدْبَرَ النَّهَارُ وَغَابَتِ الشَّمْسُ فَقَدْ أَفْطَرَ الصَّائِمُ لَمْ يَذْكُرِ ابْنُ نُمَيْرٍ فَقَدْ  

We were with the Messenger of Allah ﷺ on a journey during the month of Ramadan. When the sun had sunk he said: So and so, get down (from your ride) and prepare the meal of parched barley for us. He said: Messenger of Allah, still (there is light of) day. He (the Holy Prophet) said: Get down and prepare meal of parched barley for us. So he got down and prepared the meal of parched barley and offered him, and the apostle of Allah ﷺ drank that (liquid meal). He then told with the gesture of his hand that when the sun sank from that side and the night appeared from that side, then the observer of the fast should break it.  

كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ فِي سَفَرٍ فِي شَهْرِ رَمَضَانَ فَلَمَّا غَابَتِ الشَّمْسُ قَالَ يَا فُلاَنُ انْزِلْ فَاجْدَحْ لَنَا قَالَ يَا رَسُولَ اللَّهِ إِنَّ عَلَيْكَ نَهَارًا قَالَ انْزِلْ فَاجْدَحْ لَنَا قَالَ فَنَزَلَ فَجَدَحَ فَأَتَاهُ بِهِ فَشَرِبَ النَّبِيُّ ﷺ ثُمَّ قَالَ بِيَدِهِ إِذَا غَابَتِ الشَّمْسُ مِنْ هَا هُنَا وَجَاءَ اللَّيْلُ مِنْ هَا هُنَا فَقَدْ أَفْطَرَ الصَّائِمُ  

We were with the Messenger of Allah ﷺ on a journey. When the sun sank he said to a person: Get down and prepare barley meal for us. Upon this he said: Messenger of Allah, let there be dusk. (He the Holy Prophet) said: Get down and prepare barley meal for us. He (the person) said: There is still (the light of) day upon us. (But) he got down (in obedience to the command of the Holy Prophet) and prepared a barley meal for him and he (the Holy Prophet) drank that (liquid meal) and then said: When you see the night approaching from that side (west) (and he pointed towards the east with his hand), then the observer of the fast should break it.  

كُنَّا مَعَ رَسُولِ اللَّهِ ﷺ فِي سَفَرٍ فَلَمَّا غَابَتِ الشَّمْسُ قَالَ لِرَجُلٍ انْزِلْ فَاجْدَحْ لَنَا فَقَالَ يَا رَسُولَ اللَّهِ لَوْ أَمْسَيْتَ قَالَ انْزِلْ فَاجْدَحْ لَنَا قَالَ إِنَّ عَلَيْنَا نَهَارًا فَنَزَلَ فَجَدَحَ لَهُ فَشَرِبَ ثُمَّ قَالَ إِذَا رَأَيْتُمُ اللَّيْلَ قَدْ أَقْبَلَ مِنْ هَا هُنَا وَأَشَارَ بِيَدِهِ نَحْوَ الْمَشْرِقِ فَقَدْ أَفْطَرَ الصَّائِمُ  

We travelled with the Messenger of Allah ﷺ as he had been observing fast. When the sun sank he said: So and so, get down and prepare barley meal for us. The rest of the hadith is the same.  

سَمِعْتُ عَبْدَ اللَّهِ بْنَ أَبِي أَوْفَى ؓ يَقُولُ سِرْنَا مَعَ رَسُولِ اللَّهِ ﷺ وَهُوَ صَائِمٌ فَلَمَّا غَرَبَتِ الشَّمْسُ قَالَ يَا فُلاَنُ انْزِلْ فَاجْدَحْ لَنَا مِثْلَ حَدِيثِ ابْنِ مُسْهِرٍ وَعَبَّادِ بْنِ الْعَوَّامِ  

In this hadith transmitted by one of the narrators (neither these words are found): During the month of Ramadan." nor his statement:" And the night prevails from that side (the eastern side)." (These words are found in the narration of) Hushaim only.  

عَنِ النَّبِيِّ ﷺ بِمَعْنَى حَدِيثِ ابْنِ مُسْهِرٍ وَعَبَّادٍ وَعَبْدِ الْوَاحِدِ وَلَيْسَ فِي حَدِيثِ أَحَدٍ مِنْهُمْ فِي شَهْرِ رَمَضَانَ وَلاَ قَوْلُهُ وَجَاءَ اللَّيْلُ مِنْ هَا هُنَا إِلاَّ فِي رِوَايَةِ هُشَيْمٍ وَحْدَهُ