Jami` at-Tirmidhi 222
جامع الترمذي#222Sahihحَدَّثَنَا مُحَمَّدُ بْنُ بَشَّارٍ، حَدَّثَنَا يَزِيدُ بْنُ هَارُونَ، أَخْبَرَنَا دَاوُدُ بْنُ أَبِي هِنْدٍ، عَنِ الْحَسَنِ، عَنْ جُنْدَبِ بْنِ سُفْيَانَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " مَنْ صَلَّى الصُّبْحَ فَهُوَ فِي ذِمَّةِ اللَّهِ فَلاَ تُخْفِرُوا اللَّهَ فِي ذِمَّتِهِ " . قَالَ أَبُو عِيسَى حَدِيثٌ حَسَنٌ صَحِيحٌ .
Jundub 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
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
In-book reference: 2:74