(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated that Ibn 'Abbas said:
"The Prophet (ﷺ) used to pray two rak'ahs of Fajr when he heard the Adhan and he made them brief." (FR)
Reference (FR): Sunan an-Nasa'i 1782 (FR)
In-book reference (FR): Book 20, Hadith 185 (FR)
English translation (FR): Vol. 2, Book 20, Hadith 1783 (FR)