Sahih Al Bukhari Hadith Number 1180

Narrated Ibn ‘Umar: I remember ten Rakat of Nawafil from the Prophet, two Rakat before the Zuhr prayer and two after it; two Rakat after Maghrib prayer in his house, and two Rakat after ‘Isha’ prayer in his house, and two Rakat before the Fajr prayer and at that time nobody would enter the house of the Prophet.

Hafsa told me that the Prophet (peace be upon him) used to offer two Rakat after the call maker had made the Adhan and the day had dawned.

19  Prayer at Night (Tahajjud)
Hadith number 1180
Volume no 2
Chapter: 34 (To offer two Rak’a before the Zuhr prayer)