[Machine] The Prophet ﷺ used to perform the Witr prayer with reciting the Surah "Subhanallahi-l-‘Azeem" (Glory be to Allah, the Supreme) and "Qul ya ayyuha-l-Kafiroon" (Say: O disbelievers) and "Huwa Allahu ahad" (He is Allah, the One) and after completing the prayer, he would say "Subhanal-Malikil-Quddus" (Glory be to the Sovereign, the Holy) three times, prolonging his voice in the last one of them.
أَنَّ النَّبِيَّ ﷺ كَانَ يُوتِرُ بِسَبِّحِ اسْمَ رَبِّكَ الْأَعْلَى وَقُلْ يَا أَيُّهَا الْكَافِرُونَ وَقُلْ هُوَ اللهُ أَحَدٌ وَيَقُولُ إِذَا جَلَسَ فِي آخِرِ صَلَاتِهِ سُبْحَانَ الْمَلِكِ الْقُدُّوسِ ثَلَاثًا يَمُدُّ بِالْآخِرَةِ صَوْتَهُ