It was narrated that ‘Aishah said:“The Messenger of Allah (ﷺ) used to perform two Rak’ah before Fajr, and he used to say: ‘The best two Surah to recite in the two Rak’ah of Fajr are: “Say: Allah is One” [Al-Ikhlas (112)] and “Say: O you disbelievers.” [Al-Kafirun]

English translation · Sunan Ibn Majah