Jami` at-Tirmidhi 3776
جامع الترمذي#3776Sahihحَدَّثَنَا مُحَمَّدُ بْنُ يَحْيَى، قَالَ حَدَّثَنَا عَبْدُ الرَّزَّاقِ، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ أَنَسِ بْنِ مَالِكٍ، قَالَ لَمْ يَكُنْ أَحَدٌ مِنْهُمْ أَشْبَهَ بِرَسُولِ اللَّهِ مِنَ الْحَسَنِ بْنِ عَلِيٍّ . هَذَا حَدِيثٌ حَسَنٌ صَحِيحٌ .
Narrated Anas bin Malik:"None of them used to resemble the Messenger of Allah (ﷺ) more than Al-Hasan bin 'Ali
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:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih Bukhari
In-book reference: 49:175