Jami` at-Tirmidhi 3808
جامع الترمذي#3808Da'ifحَدَّثَنَا عَبْدُ اللَّهِ بْنُ عَبْدِ الرَّحْمَنِ، قَالَ أَخْبَرَنَا صَاعِدٌ الْحَرَّانِيُّ، قَالَ حَدَّثَنَا زُهَيْرٌ، قَالَ حَدَّثَنَا مَنْصُورٌ، عَنْ أَبِي إِسْحَاقَ، عَنِ الْحَارِثِ، عَنْ عَلِيٍّ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم " لَوْ كُنْتُ مُؤَمِّرًا أَحَدًا مِنْ غَيْرِ مَشُورَةٍ مِنْهُمْ لأَمَّرْتُ عَلَيْهِمُ ابْنَ أُمِّ عَبْدٍ " . قَالَ أَبُو عِيسَى هَذَا حَدِيثٌ غَرِيبٌ إِنَّمَا نَعْرِفُهُ مِنْ حَدِيثِ الْحَارِثِ عَنْ عَلِيٍّ .
Narrated 'Ali:that the Messenger of Allah (ﷺ) said: "If I was going to appoint anyone of them as a leader without any consultation, I would appoint Ibn Umm 'Abd over them
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: 49:208