It was narrated from Ibn Abdur-Rahman bin Abza from his father that:
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) raising his voice the third time."
Reference: Sunan an-Nasa'i 1750 In-book : Book 20, Hadith 153 English translation : Vol. 2, Book 20, Hadith 1751
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