Sunan an-Nasa'i 946
سنن النسائي#946SahihIt 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?
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Abu GhuddahSahih
Al-AlbaniSahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 11:71