Sahih Bukhari Volume 004, Book 056, Hadith Number 823.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 56. Virtues and Merits of the Prophets (PBUH) and his Companions
Narated By Abu Bakra : Once the Prophet brought out Al-Hasan and took him up the pulpit along with him and said, "This son of mine is a Saiyid (i.e. chief) and I hope that Allah will help him bring about reconciliation between two Muslim groups."