Sunan al-Nasa'i The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day Habib bin Abi Thabit حبيب بن أبي ثابت قيس ibn Abbas Ma'mr bin Mkhld معمر بن مخلد Muhammad bin Muhammad bin 'Ali b. al-Hussain al-Baqir محمد بن علي بن الحسين بن علي ,الباقر Ubaidullah bin 'Umar al-Qawariri عبيد الله بن عمر القواريري Zayd ibn Harithah “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.” https://parallelquran.com/hadith/sunan-al-nasai-1706/