(57) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ
It was narrated from Hafsah that:
When the call for Subh prayer was given, the Messenger of Allah (ﷺ) would pray two brief rak'ahs before going to the prayer.
Reference: Sunan an-Nasa'i 1760
In-book reference: Book 20, Hadith 163
English translation: Vol. 2, Book 20, Hadith 1761