Jami` at-Tirmidhi 419
جامع الترمذي#419Da'ifIbn Umar narrated that:Allah's Messenger (S) said: "There is no Salat after Al-Fajr (begins) except two prostrations
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Zubair Ali ZaiDaif
In-book reference: 2:272