The Messenger of Allah (ﷺ) used to observe thirteen rak'ahs of the night prayer. Five out of them consisted of Witr, and he did not sit, but at the end (for salutation).
Reference: Sahih Muslim 737 a In-book : Book 6, Hadith 149 USC-MSA web (English) : Book 4, Hadith 1604 (deprecated)
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