Abu Bakrah said:
"I saw the Messenger of Allah (ﷺ) on the Minbar, and Al-Hasan was with him. He would turn to the people sometime and turn to him (Al-Hasan) sometimes, and he said: 'This son of mine is a leader (Sayyid) and Allah (SWT) may make peace between two large groups of Muslims through him.'"
App reference: Book 14, Hadith 47
English reference: Vol. 2, Book 14, Hadith 1411
Arabic reference: Book 14, Hadith 1421