It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: Qatadah (may Allah have mercy on him) asked this question: If a man has prayed only one rak'ah of Fajr and then the sun rises, what is the ruling? He narrated with his chain that the Noble Prophet (peace and blessings be upon him) said: Such a person should complete his prayer.