Abu Bakra reported,

The Messenger of Allah ﷺ was once praying, and whenever he prostrated, Hasan would jump onto his back and his neck. The Messenger of Allah ﷺ would rise gently so as not to make him fall. He did this more than once.When he had finished his prayer, they said, "Messenger of Allah, we saw you do something with Hasan that we have never seen you do before."He replied, "He is my fragrant flower from this world. This son of mine is a master, and perhaps Allah will reconcile two great factions of the Muslims through him."

حدثنا عفان حدثنا مبارك بن فضالة عن الحسن أخبرني

أبو بكرة

أن رسول الله ﷺ كان يصلي فإذا سجد وثب الحسن على ظهره وعلى عنقه فيرفع رسول الله ﷺ رفعا رفيقا لئلا يصرع قال فعل ذلك غير مرة فلما قضى صلاته قالوا يا رسول الله رأيناك صنعت بالحسن شيئا ما رأيناك صنعته قال إنه ريحانتي من الدنيا وإن ابني هذا سيد وعسى الله تبارك وتعالى أن يصلح به بين فئتين من المسلمين