كتاب قيام الليل وتطوع النهار
20  
The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
(60)
Chapter: The time for the two rak'ahs of Fajr, and mentioning the differences reported from Nafi'
(60)
باب وَقْتِ رَكْعَتَىِ الْفَجْرِ وَذِكْرِ الاِخْتِلاَفِ عَلَى نَافِعٍ
Sunan an-Nasa'i 1774
It was narrated that Abdullah said:
"My sister Hafsah told me that he used to pray two brief rak'ahs before Fajr."
أَخْبَرَنَا إِسْمَاعِيلُ بْنُ مَسْعُودٍ، قَالَ حَدَّثَنَا خَالِدُ بْنُ الْحَارِثِ، قَالَ حَدَّثَنَا عُبَيْدُ اللَّهِ، عَنْ نَافِعٍ، عَنْ عَبْدِ اللَّهِ، قَالَ حَدَّثَتْنِي أُخْتِي، حَفْصَةُ أَنَّهُ كَانَ يُصَلِّي قَبْلَ الْفَجْرِ رَكْعَتَيْنِ خَفِيفَتَيْنِ ‏.‏
Grade: Sahih (Darussalam)
Reference : Sunan an-Nasa'i 1774
In-book reference : Book 20, Hadith 177
English translation : Vol. 2, Book 20, Hadith 1775