A man from among the people of the desert asked the Messenger of Allah (ﷺ) about prayer at night. He said:"(It is) two by two, and Witr is one rak'ah at the end of the night."
Reference: Sunan an-Nasa'i 1691 In-book : Book 20, Hadith 94 English translation : Vol. 2, Book 20, Hadith 1692
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