[Machine] On the authority of the Prophet ﷺ who said, "Make the last of your prayers at night a Witr prayer."  

عَنِ النَّبِيِّ ﷺ قَالَ اجْعَلُوا آخِرَ صَلَاتِكُمْ بِاللَّيْلِ وِتْرًا  

He who observed the night prayer should make Witr the end of his prayer before dawn. The Messenger of Allah ﷺ used to order them thus. (Using translation from Muslim 751c)   

أَنَّ ابْنَ عُمَرَ كَانَ يَقُولُ مَنْ صَلَّى مِنَ اللَّيْلِ فَلْيَجْعَلْ آخِرَ صَلَاتِهِ وِتْرًا قَبْلَ الصُّبْحِ كَذَلِكَ كَانَ رَسُولُ اللهِ ﷺ يَأْمُرُهُمْ  

A person asked the Messenger of Allah ﷺ as I stood between him (the Holy Prophet) and the inquirer and he said: Messenger of Allah, how is the night prayer? He (the Holy Prophet) said: It consists of pairs of rak'ahs, but if you apprehend morning, you should pray one rak'ah and make the end of your prayer as Witr. Then a person asked him (the Holy Prophet) at the end of the year and I was at that place near the Messenger of Allah ﷺ ; but I do not know whether he was the same person or another person, but he (the Holy Prophet) gave him the same reply. (Using translation from Muslim 749d)   

أَنَّ رَجُلًا سَأَلَ النَّبِيَّ ﷺ وَأَنَا بَيْنَهُ وَبَيْنَ السَّائِلِ فَقَالَ يَا رَسُولَ اللهِ كَيْفَ صَلَاةُ اللَّيْلِ؟ قَالَ مَثْنَى مَثْنَى فَإِذَا خَشِيتَ الصُّبْحَ فَصَلِّ رَكْعَةً وَاجْعَلْ آخِرَ صَلَاتِكَ وِتْرًا ثُمَّ سَأَلَهُ رَجُلٌ عَلَى رَأْسِ الْحَوْلِ وَأَنَا بِذَلِكَ الْمَكَانِ مِنْ رَسُولِ اللهِ ﷺ فَلَا أَدْرِي هُوَ ذَاكَ الرَّجُلُ أَوْ رَجُلٌ آخَرُ فَقَالَ لَهُ مِثْلَ ذَلِكَ  

[Machine] The Messenger of Allah ﷺ used to pray at night until the last prayer of his was Witr.  

كَانَ رَسُولُ اللهِ ﷺ يُصَلِّي مِنَ اللَّيْلِ حَتَّى يَكُونَ آخِرُ صَلَاتِهِ الْوِتْرَ  

[Machine] The night prayer of the Messenger of Allah ﷺ was said to be thirteen rak'ahs. Then it was mentioned that he prayed eleven rak'ahs and left two rak'ahs. Then, when he was taken (passed away), he was praying nine rak'ahs in the night prayer. The last prayer he prayed at night was the Witr prayer. Muhammad bin Ishaq bin Khuzaimah differed with Muhmal bin Hisham on this matter. Abu Ishaq narrated from Masrooq and the narration of Abu Dawood is the most authentic based on the evidence of what was mentioned from the narration of Ammar bin Ruzayq.  

صَلَاةِ رَسُولِ اللهِ ﷺ بِاللَّيْلِ فَقَالَتْ كَانَ يُصَلِّي ثَلَاثَ عَشْرَةَ رَكْعَةً مِنَ اللَّيْلِ ثُمَّ إِنَّهُ صَلَّى إِحْدَى عَشْرَةَ رَكْعَةً وَتَرَكَ رَكْعَتَيْنِ ثُمَّ قُبِضَ حِينَ قُبِضَ وَهُوَ يُصَلِّي مِنَ اللَّيْلِ تِسْعَ رَكَعَاتٍ آخِرُ صَلَاتِهِ مِنَ اللَّيْلِ الْوِتْرُ خَالَفَهُ مُحَمَّدُ بْنُ إِسْحَاقَ بْنِ خُزَيْمَةَ عَنْ مُؤَمَّلِ بْنِ هِشَامٍ فَقَالَ عَنْ أَبِي إِسْحَاقَ عَنْ مَسْرُوقٍ وَرِوَايَةُ أَبِي دَاوُدَ أَصَحُّ بِدَلِيلِ مَا تَقَدَّمَ مِنْ رِوَايَةِ عَمَّارِ بْنِ رُزَيْقٍ