Chapter: It is recommended to pray two rak`ah for the sunnah of Fajr. And encouragement to pray them regularly, and to make them brief, and to persist in offering them, and clarifying what is recommended to recite therein
Hafsa reported that when it was dawn, the Messenger of Allah ( صلی اللہ علیہ وسلم ) did not observe (any other prayers) but two short rak'ahs.
Authentic