Volume 1, Book 11, Number 632:
Narrated Malik Ibn Buhaina:
Allah’s Apostle passed by a man praying two Rakat after the Iqama (had been pronounced). When
Allah’s Apostle completed the prayer, the people gathered around him (the Prophet) or that man and
Allah’s Apostle said to him (protesting), Are there four Rakat in Fajr prayer? Are there four Rakat in
Fajr prayer?”