That he came to the Mother of the Believers Aishah and asked her about the prayers of the Messenger of Allah (ﷺ). She said: "He used to pray eight rak'ahs at night and pray witr with the ninth, then he would pray two rak'ahs sitting down."
Reference: Sunan an-Nasa'i 1724 In-book : Book 20, Hadith 127 English translation : Vol. 2, Book 20, Hadith 1725
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