The Messenger of Allah (ﷺ) used to pray thirteen rak'ahs, observing six rak'ahs in pairs including the two rak'ahs of dawn prayer. He would observe witr and five rak'ahs. He sat only in the last of them.
Reference: Sunan Abi Dawud 1359 In-book : Book 5, Hadith 110 English translation : Book 5, Hadith 1354
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