Hafsah (May Allah be pleased with her) reported:
The Messenger of Allah (ﷺ) used to perform two short Rak'ah prayer when it was dawn and the Mu'adhdhin had called Adhan (for the Fajr prayer).[Al-Bukhari and Muslim].
App reference: Book 9, Hadith 115
Arabic/English book reference: Book 9, Hadith 1105