Narrated Isma'il bin Abi Khalid:
that Abu Juhaifah said: "I saw the Prophet (ﷺ), and Al-Hasan bin 'Ali resembles him the most." (ID)
English reference (ID): Vol. 5, Book 41, Hadith 2827 (ID)
Arabic reference (ID): Book 43, Hadith 3061 (ID)