Sahih Bukhari 1134

Narrated Abu-Wail: `Abdullah said, One night I offered the Tahajjud prayer with the Prophet and he kept on standing till an ill-thought came to me. We said, What was the ill-thought? He said, It was to sit down and leave the Prophet..

Narrated Hudhaifa: Whenever the Prophet got up for Tahajjud prayer he used to clean his mouth (and teeth) with Siwak. ..

Narrated `Abdullah bin `Umar: A man said, O Allah's Apostle! How is the prayer of the night? He said, Two rak`at followed by two rak`at and so on, and when you apprehend the approaching dawn, offer one rak`a as witr. ..

Narrated Ibn `Abbas: The prayer of the Prophet used to be of thirteen rak`at, i.e. of the night prayer. ..

Narrated Masruq: I asked Aisha about the night prayer of Allah's Apostle and she said, It was seven, nine or eleven rak`at besides the two rak`at of the Fajr prayer (i.e. Sunna). ..

Narrated `Aisha: 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. ..