(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from Hafsah that:
The Prophet (ﷺ) used to pray the two rak'ahs of Fajr, two brief rak'ahs. (ID)
Reference (ID): Sunan an-Nasa'i 1765 (ID)
In-book reference (ID): Book 20, Hadith 168 (ID)
English translation (ID): Vol. 2, Book 20, Hadith 1766 (ID)