Maliks Muwatta Book 007, Hadith Number 008.

Section : How the Prophet, may Allah bless him and grant him peace, Prayed the Witr.

Yahya related to me from Malik from Ibn Shihab from Urwa ibn az-Zubayr from A'isha, the wife of the Prophet, may Allah bless him and grant him peace, that the Messenger of Allah, may Allah bless him and grant him peace, used to pray eleven rakas in the night, making them odd by a single one, and when he had finished he lay down on his right side.