"The Messenger of Allah (ﷺ) used to pray witr with thirteen rak'ahs, but when he grew older and weaker he prayed witr with nine."
Sunan an-Nasa'i Book 20, Hadith 130
← Previous Hadith The Prophet (ﷺ) used to pray eleven rak'ahs at night, of which one was witr, then he would lie down on his right side.

Sunan an-Nasa'i Book 20, Hadith 129 Next Hadith → Abu Musa was between Makkah and Al-Madinah. He prayed 'Isha with two rak'ahs, then he stood and prayed one rak'ah of witr in which he recited one hundred verses from An-Nisa'. Then he said: "I tried my best to place my feet where the Messenger of Allah (ﷺ) placed his, and to recite what the Messenger of Allah (ﷺ) recited."

Sunan an-Nasa'i Book 20, Hadith 131