Sahih Bukhari
Prayer at Night (Tahajjud)
Volume: 002 / Book Number: 021 / Hadith Number: 269
Narrated Ibn 'Umar:
I offered with the Prophet two Rakat before the Zuhr and two Rakat after the Zuhr prayer; two Rakat after Maghrib, Isha' and the Jumua prayers. Those of the Maghrib and 'Isha' were offered in his house. My sister Hafsa told me that the Prophet used to offer two light Rakat after dawn and it was the time when I never went to the Prophet."