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