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