"Hafsah told me that when dawn glowed, the Prophet (ﷺ) would pray two rak'ahs.
Sunan an-Nasa'i Book 20, Hadith 164
← Previous Hadith When the call for Subh prayer was given, the Messenger of Allah (ﷺ) would pray two brief rak'ahs before going to the prayer.

Sunan an-Nasa'i Book 20, Hadith 163 Next Hadith → "When the Muaddhin fell silent after the Adhan for the beginning of Fajr, he would pray two brief rak'ahs, then he would lie down on his right side."

Sunan an-Nasa'i Book 20, Hadith 165