(60) باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
It was narrated from Ibn 'Umar that Hafsah said:
"The Messenger of Allah (ﷺ) used to pray two brief rak'ahs between the call (the Adhan) and the prayer." (ID)
Reference (ID): Sunan an-Nasa'i 1767 (ID)
In-book reference (ID): Book 20, Hadith 170 (ID)
English translation (ID): Vol. 2, Book 20, Hadith 1768 (ID)