(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." (ES)
Reference (ES): Sunan an-Nasa'i 1779 (ES)
In-book reference (ES): Book 20, Hadith 182 (ES)
English translation (ES): Vol. 2, Book 20, Hadith 1780 (ES)