(22) باب مَنَاقِبُ الْحَسَنِ وَالْحُسَيْنِ رضى الله عنهما
Narrated Abu Bakra:
I heard the Prophet (ﷺ) talking at the pulpit while Al-Hasan was sitting beside him, and he (i.e. the Prophet ) was once looking at the people and at another time Al-Hasan, and saying, "This son of mine is a Saiyid (i.e. chief) and perhaps Allah will bring about an agreement between two sects of the Muslims through him."
Reference: Sahih al-Bukhari 3746
In-book reference: Book 62, Hadith 93
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 57, Hadith 89