Sunan an-Nasa'i #1751 · The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day

Sunan an-Nasa'iIt was narrated from Sa'eed bin Abdur-Rahman bin Abza that
Sunan an-Nasa'i · Book 20 · The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Sunan an-Nasa'i · كتاب 20 · كتاب قيام الليل وتطوع النهار
His father said: "The Messenger of Allah (ﷺ) used to recite in witr: Glorify the Name of Your Lord, the Most High;' and "Say: O you disbelievers!'; and 'Say: He is Allah, (the) One." And after he had said the salam, he would say: Subhanal-Malikil-Quddus (Glory be to the Sovereign, the Most Holy) three times, raising his voice with it
أَخْبَرَنَا أَحْمَدُ بْنُ يَحْيَى، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ عُبَيْدٍ، عَنْ سُفْيَانَ الثَّوْرِيِّ، وَعَبْدِ الْمَلِكِ بْنِ أَبِي سُلَيْمَانَ، عَنْ زُبَيْدٍ، عَنْ سَعِيدِ بْنِ عَبْدِ الرَّحْمَنِ بْنِ أَبْزَى، عَنْ أَبِيهِ، قَالَ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُوتِرُ بِـ ‏{‏ سَبِّحِ اسْمَ رَبِّكَ الأَعْلَى ‏}‏ وَ ‏{‏ قُلْ يَا أَيُّهَا الْكَافِرُونَ ‏}‏ وَ ‏{‏ قُلْ هُوَ اللَّهُ أَحَدٌ ‏}‏ وَيَقُولُ بَعْدَ مَا يُسَلِّمُ ‏
"‏ سُبْحَانَ الْمَلِكِ الْقُدُّوسِ ‏"‏ ‏.‏ ثَلاَثَ مَرَّاتٍ يَرْفَعُ بِهَا صَوْتَهُ ‏.‏ خَالَفَهُمَا أَبُو نُعَيْمٍ فَرَوَاهُ عَنْ سُفْيَانَ عَنْ زُبَيْدٍ عَنْ ذَرٍّ عَنْ سَعِيدٍ ‏.‏
Reference : Sunan an-Nasa'i 1751In-book reference : Book 20, Hadith 154