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.'" (ID)
App reference (ID): Book 14, Hadith 47 (ID)
English reference (ID): Vol. 2, Book 14, Hadith 1411 (ID)
Arabic reference (ID): Book 14, Hadith 1421 (ID)