Hadith #1706 (Sunan al-Nasa'i)
Book: The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Narrator(s): 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.”

Source: https://parallelquran.com/hadith/sunan-al-nasai-1706/