Riyad as-Salihin

'Aishah (May Allah be pleased with her) reported: The Prophet (ﷺ) used to perform two Rak'ah short prayer between the Adhan (call to prayer) and the Iqamah of the dawn (Fajr) prayers.

[Al- Bukhari and Muslim]

In another narration, 'Aishah (May Allah be pleased with her) said: The Messenger of Allah (ﷺ) used to perform two supererogatory Rak'ah prayer of Fajr and make them so short in duration that I used to think whether he (ﷺ) had recited Surat Al-Fatihah (in it) or not.

[Al-Bukhari and Muslim]

In the narration of Muslim, 'Aishah (May Allah be pleased with her) said: When the Messenger of Allah (ﷺ) used to hear the Adhan (of Fajr prayer) he would perform two supererogatory Rak'ah prayer and would make them short.