Sunan Abi Dawud Book 5, Hadith 85
The Messenger of Allah (ﷺ) used to pray ten rak'ahs during the night, and would observe the witr with one rak'ah, he then prayed two rak'ahs of the dawn prayer. Thus he prayed thirteen rak'ahs in all.
The Prophet (ﷺ) said: One who recites the Qur'an in a loud voice is like one who gives alms openly; and one who recites the Qur'an quietly is one who gives alms secretly.
The Messenger of Allah (ﷺ) used to pray eleven rak'ahs (at night, observing the witr with one rak'ahs). When he finished it (the prayer), he would lie down on his right side.