Muwatta Malik Book 7, Hadith 7
Yahya related to me from Malik that he had heard that Abdullah
ibn Umar used to say, "(Voluntary) prayer in both the day and night is
two at a time with a taslim after every 2 raka'ahs."
Malik said,
"That is the custom among us."
Yahya related to me from Malik that he had heard that Said ibn al-Musayyab used to say, "Sleep is disapproved of before isha and conversation after it."
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.