It was narrated from Nafi' bin Jubair, from his father, that the Messenger of Allah (ﷺ) 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 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

English translation · Sunan an-Nasa'i