(1) باب مَا جَاءَ فِي الْوِتْرِ
Narrated `A'isha:
Allah's Messenger (ﷺ) used to pray eleven rak`at at night and that was his night prayer and each of his prostrations lasted for a period enough for one of you to recite fifty verses before Allah's Messenger (ﷺ) raised his head. He also used to pray two rak`at (Sunnah) before the (compulsory) Fajr prayer and then lie down on his right side till the Mu'adh-dhin came to him for the prayer.
Reference: Sahih al-Bukhari 994
In-book reference: Book 14, Hadith 5
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 2, Book 16, Hadith 108