Jami` at-Tirmidhi 586
جامع الترمذي#586Da'ifAnas bin Malik narrated that :the Messenger of Allah said: "Whoever prays Fajr in congregation, then sits remembering Allah until the sun has risen, then he prays two Rak'ah, then for him is the reward like that of a Hajj and Umrah." He said: "The Messenger of Allah said: 'Complete, complete, complete
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirHasan
Al-AlbaniHasan
Bashar Awad MaaroufHasan
Zubair Ali ZaiDaif
In-book reference: 6:43