Volume 2, Book 16, Number 109:
Narrated Anas bin Sirin:
I asked Ibn ‘Umar, “What is your opinion about the two Rakat before the Fajr (compulsory) prayer,
as to prolonging the recitation in them?” He said, “The Prophet (p.b.u.h) used to pray at night two
Rakat followed by two and so on, and end the prayer by one Raka Witr. He used to offer two Rakat
before the Fajr prayer immediately after the Adhan.” (Hammad, the sub-narrator said, “That meant
(that he prayed) quickly.)”