(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from Salim that his father said:
"Hafsah told me that when dawn glowed, the Messenger of Allah (ﷺ) would pray two rak'ahs." (FR)
Reference (FR): Sunan an-Nasa'i 1779 (FR)
In-book reference (FR): Book 20, Hadith 182 (FR)
English translation (FR): Vol. 2, Book 20, Hadith 1780 (FR)