(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from Abdullah bin Umar, from Hafsah, that:
The Messenger of Allah (ﷺ) used to pray two rak'ahs when dawn had broken. (IT)
Reference (IT): Sunan an-Nasa'i 1775 (IT)
In-book reference (IT): Book 20, Hadith 178 (IT)
English translation (IT): Vol. 2, Book 20, Hadith 1776 (IT)