(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from Ibn Umar that Hafsah said:
"When dawn came, the Messenger of Allah (ﷺ) would not pray anything but two brief rak'ahs." (ES)
Reference (ES): Sunan an-Nasa'i 1776 (ES)
In-book reference (ES): Book 20, Hadith 179 (ES)
English translation (ES): Vol. 2, Book 20, Hadith 1777 (ES)