The Messenger of Allah ﷺ said, "Hasan and Husayn are the masters of the youth of Paradise."
حدثنا أبو نعيم حدثنا سفيان عن يزيد بن أبي زياد عن ابن أبي نعم
قال رسول الله ﷺ الحسن والحسين سيدا شباب أهل الجنة
Its isnad is sahih, and it is in the Sahih collections, and it has already appeared at 10941, 11537, 11561.