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