(40) باب تَخْفِيفِ رَكْعَتَىِ الْفَجْرِ
It was narrated that Aishah said:
"I would see the Messenger of Allah (ﷺ) praying two rak'ahs of Fajr and making them so brief that I said: 'Did he recite the Umm Al-Kitab in them?'"
Reference: Sunan an-Nasa'i 946
In-book reference: Book 11, Hadith 71
English translation: Vol. 2, Book 11, Hadith 947