Jami` at-Tirmidhi 3686
جامع الترمذي#3686Hasanحَدَّثَنَا سَلَمَةُ بْنُ شَبِيبٍ، قَالَ حَدَّثَنَا الْمُقْرِئُ، عَنْ حَيْوَةَ بْنِ شُرَيْحٍ، عَنْ بَكْرِ بْنِ عَمْرٍو، عَنْ مِشْرَحِ بْنِ هَاعَانَ، عَنْ عُقْبَةَ بْنِ عَامِرٍ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لَوْ كَانَ بَعْدِي نَبِيٌّ لَكَانَ عُمَرَ بْنَ الْخَطَّابِ " . قَالَ هَذَا حَدِيثٌ حَسَنٌ غَرِيبٌ لاَ نَعْرِفُهُ إِلاَّ مِنْ حَدِيثِ مِشْرَحِ بْنِ هَاعَانَ .
Narrated 'Uqbah bin 'Amir:that the Messenger of Allah (ﷺ) said: "If there was to have a Prophet after me, it would have been 'Umar bin Al-Khattab
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: 49:82