It was narrated from Nafi’ bin Jubair, from his father, that the Messenger of Allah صلی اللہ علیہ وآلہ وسلم said during a journey: “Who will watch out for dawn for us, so that we do not sleep and miss the dawn prayer?” Bilal said: ‘I will.’ He turned to face the direction where the sun would rise, but they fell fast asleep until the heat of the sun woke them up, then they got up. He said: ‘Perform Wudu’.’ Then Bilal called the Adhan and he prayed two Rak’ahs, and they prayed the two (Sunnah) Rak’ahs of Fajr, then they prayed Fajr.” (Sahih)