Jami` at-Tirmidhi 222
جامع الترمذي#222SahihJundub bin Sufyan narrated that :the Prophet said: "Whoever prays the Subh then he is under the protection of Allah's covenant, so do not be treacherous with Allah in his covenant
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 ZaiSahih Muslim
In-book reference: 2:74