"We fasted Ramadan with the Messenger of Allah ﷺ, and the Prophet ﷺ did not lead us in Qiyam until there were seven days left of the month, then he led us in Qiyam until one-third of the night had passed. Then, when there were six days left, he did not lead us in Qiyam. When there were five days left, he led us in praying Qiyam until half the night had passed. We said: 'O Messenger of Allah (SA), why don't you lead us in praying Qiyam for the rest of the night?' He said: 'If a man prays with the Imam until he leaves, that will be continued for him as if he spent the whole night in prayer.' Then, when there were four days left, he did not lead us in praying Qiyam. When there were three days left he sent for his daughters and women, and gathered the people, and he led us in praying Qiyam until we feared that we would miss Al-Falah. Then he did not lead us in praying Qiyam for the rest of the month." Dawud (one of the narrators) said: "I said: ' What is falah?' He said: 'Sahur.' (Using translation from Nasāʾī 1364)  

صُمْنَا مَعَ رَسُولِ اللهِ ﷺ رَمَضَانَ فَلَمْ يَقُمْ بِنَا النَّبِيُّ ﷺ حَتَّى بَقِيَ سَبْعٌ مِنَ الشَّهْرِ فَقَامَ بِنَا حَتَّى ذَهَبَ نَحْوٌ مِنْ ثُلُثِ اللَّيْلِ ثُمَّ كَانَتْ سَادِسَةٌ فَلَمْ يَقُمْ فَلَمَّا كَانَتِ الْخَامِسَةُ قَامَ بِنَا حَتَّى ذَهَبَ نَحْوٌ مِنْ شَطْرِ اللَّيْلِ قُلْتُ يَا رَسُولَ اللهِ لَوْ نَفَّلْتَنَا قِيَامَ هَذِهِ اللَّيْلَةِ قَالَ «إِنَّ الرَّجُلَ إِذَا صَلَّى مَعَ الْإِمَامِ حَتَّى يَنْصَرِفَ حُسِبَ لَهُ قِيَامُ لَيْلَةٍ» قَالَ ثُمَّ كَانَتِ الرَّابِعَةُ فَلَمْ يَقُمْ بِنَا فَلَمَّا بَقِيَ ثَلَاثٌ مِنَ الشَّهْرِ أَرْسَلَ إِلَى بَنَاتِهِ وَنِسَائِهِ وَحَشَدَ النَّاسَ فَقَامَ بِنَا حَتَّى خَشِينَا أَنْ يَفُوتَنَا الْفَلَاحُ ثُمَّ لَمْ يَقُمْ بِنَا شَيْئًا مِنَ الشَّهْرِ قَالَ دَاوُدُ قُلْتُ مَا الْفَلَاحُ؟ قَالَ السَّحُورُ