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
← Previous Hadith The Prophet (ﷺ) said: "The two rak'ahs (before) Fajr are better than this world and everything in it."

Sunan an-Nasa'i Book 20, Hadith 162 Next Hadith → "Hafsah told me that when dawn glowed, the Prophet (ﷺ) would pray two rak'ahs.

Sunan an-Nasa'i Book 20, Hadith 164