The Messenger of Allah (ﷺ) used to pray two rak'ahs when dawn had broken.
Sunan an-Nasa'i Book 20, Hadith 178
← Previous Hadith "My sister Hafsah told me that he used to pray two brief rak'ahs before Fajr."

Sunan an-Nasa'i Book 20, Hadith 177 Next Hadith → "When dawn came, the Messenger of Allah (ﷺ) would not pray anything but two brief rak'ahs."

Sunan an-Nasa'i Book 20, Hadith 179