The Messenger of Allah ﷺ used to pray witr with three rak'ahs. In the first he would recite: "Glorify the Name of Your Lord, the Most High" in the second: "Say: O you disbelievers!", and in the third: "Say: He is Allah, (the) One". And he would say the Qunut before bowing, and when he finished he would say: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy) three times, elongating the words the last time.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُوتِرُ بِثَلاَثِ رَكَعَاتٍ كَانَ يَقْرَأُ فِي الأُولَى بِ { سَبِّحِ اسْمَ رَبِّكَ الأَعْلَى } وَفِي الثَّانِيَةِ بِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَفِي الثَّالِثَةِ بِ { قُلْ هُوَ اللَّهُ أَحَدٌ } وَيَقْنُتُ قَبْلَ الرُّكُوعِ فَإِذَا فَرَغَ قَالَ عِنْدَ فَرَاغِهِ سُبْحَانَ الْمَلِكِ الْقُدُّوسِ ثَلاَثَ مَرَّاتٍ يُطِيلُ فِي آخِرِهِنَّ  

"The Messenger of Allah ﷺ used to recite: "Glorify the Name of Your Lord, the Most High;" in witr, in the second rak'ah he would recite: "Say: O you disbelievers!"; and in the third "Say: He is Allah, (the) One". And he only said the taslim at the end, and he would say- meaning after the taslim: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy)' three times."  

كَانَ رَسُولُ اللَّهِ ﷺ يَقْرَأُ فِي الْوَتْرِ بِ { سَبِّحِ اسْمَ رَبِّكَ الأَعْلَى } وَفِي الرَّكْعَةِ الثَّانِيَةِ بِ { قُلْ يَا أَيُّهَا الْكَافِرُونَ } وَفِي الثَّالِثَةِ بِ { قُلْ هُوَ اللَّهُ أَحَدٌ } وَلاَ يُسَلِّمُ إِلاَّ فِي آخِرِهِنَّ وَيَقُولُ يَعْنِي بَعْدَ التَّسْلِيمِ سُبْحَانَ الْمَلِكِ الْقُدُّوسِ ثَلاَثًا  

The Messenger of Allah ﷺ used to pray witr with three rak'ahs. In the first he would recite: "Glorify the Name of Your Lord, the Most High" in the second: "Say: O you disbelievers!", and in the third: "Say: He is Allah, (the) One". And he would say the Qunut before bowing, and when he finished he would say: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy) three times, elongating the words the last time. (Using translation from Nasāʾī 1699)  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُوتِرُ بِثَلَاثِ رَكَعَاتٍ يَقْرَأُ فِي الْأُولَى بِسَبِّحِ اسْمَ رَبِّكَ الْأَعْلَى وَفِي الثَّانِيَةِ بِقُلْ يَا أَيُّهَا الْكَافِرُونَ وَفِي الثَّالِثَةِ بِقُلْ هُوَ اللهُ أَحَدٌ وَيَقْنُتُ قَبْلَ الرُّكُوعِ فإِذَا فَرَغَ قَالَ عِنْدَ فَرَاغِهِ «سُبْحَانَ الْمَلِكِ الْقُدُّوسِ» ثَلَاثَ مَرَّاتٍ يُطِيلُ فِي آخِرِهِنَّ  

[Machine] The Prophet of Allah, ﷺ , used to perform three voluntary units of prayer without reciting the final salutation in them until he completed the first unit by saying "Subhan Rabbi al-A'la" (Glory be to my Lord, the Most High), the second unit by saying "Qul ya ayyuha al-kafiroon" (Say, O disbelievers), and the third unit by saying "Huwa Allahu ahad" (He is Allah, the One). He would prolong the recitation before bowing down, and when he finished, he would say "Subhan al-Malik al-Quddus" (Glory be to the King, the Holy) twice, and in the third unit, he would raise his voice.  

أَنَّ رَسُولَ اللهِ ﷺ كَانَ يُوتِرُ بِثَلَاثِ رَكَعَاتٍ لَا يُسَلِّمُ فِيهِنَّ حَتَّى يَنْصَرِفَ الْأُولَى بِسَبِّحِ اسْمَ رَبِّكَ الْأَعْلَى وَالثَّانِيَةِ بِقُلْ يَا أَيُّهَا الْكَافِرُونَ وَالثَّالِثَةِ بِقُلْ هُوَ اللهُ أَحَدٌ وَقَنَتَ قَبْلَ الرُّكُوعِ فَلَمَّا انْصَرَفَ قَالَ سُبْحَانَ الْمَلِكِ الْقُدُّوسِ مَرَّتَيْنِ وَرَفَعَ صَوْتَهُ فِي الثَّالِثَةِ