I asked Aisha about the night prayer of Allah's Messenger (ﷺ) and she said, "It was seven, nine or eleven rak`at besides the two rak`at of the Fajr prayer (i.e. Sunna). "
Sahih al-Bukhari Book 19, Hadith 20
← Previous Hadith The prayer of the Prophet (ﷺ) used to be of thirteen rak`at, i.e. of the night prayer.

Sahih al-Bukhari Book 19, Hadith 19 Next Hadith → The Prophet (p.b.u.h) used to offer thirteen rak`at of the night prayer and that included the witr and two rak`at (Sunna) of the Fajr prayer.

Sahih al-Bukhari Book 19, Hadith 21