I saw the Messenger of Allah ﷺ on the pulpit with Hasan beside him. He would turn to the people once and to him once, saying, "This son of mine is a master, and perhaps Allah
will reconcile through him two great factions of the Muslims."
حدثنا سفيان عن أبي موسى ويقال له إسرائيل قال سمعت الحسن قال سمعت أبا بكرة وقال سفيان مرة
رأيت رسول الله ﷺ على المنبر وحسن عليه السلام معه وهو يقبل على الناس مرة وعليه مرة ويقول إن ابني هذا سيد ولعل الله تبارك وتعالى أن يصلح به بين فئتين من المسلمين
Its isnad is sahih. It has already appeared at the beginning of the Musnad, and it is found in Bukhari in the chapter on reconciliation, 5/307, no. 2704, Fath al-Bari, in Abu Dawud in the chapter on Sunnah, 4/216, no. 4662, in Tirmidhi 5/658, no. 3773, in the chapter on virtues, where he said it is hasan sahih, and in Nasai 3/107 in the chapter on Friday.