"In the first rak'ah of witr, the Messenger of Allah (ﷺ) used to recite: "GLorify the Name of your Lord, the Most High;" in the second; "Say: O you disbelievers!" and in the third; "Say: He is Allah, (the) One."
Reference: Sunan an-Nasa'i 1700 In-book : Book 20, Hadith 103 English translation : Vol. 2, Book 20, Hadith 1701
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