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."
App reference: Book 7, Hadith 7
USC-MSA web (English) reference: Book 7, Hadith 7
Arabic reference: Book 7, Hadith 261