It is narrated from Hazrat Aisha (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) used to perform four rak'ahs before Zuhr and two rak'ahs before Fajr, and he used to say: "How excellent are these two surahs: 'Say: O disbelievers' and 'Say: He is Allah, the One'," which the Prophet (peace and blessings be upon him) used to recite in the two rak'ahs before Fajr.