Anas ibn Malik narrates that the Messenger of Allah (ص) said:
"Two angels descended upon me, which had not descended since the creation of the earth until then. They gave me the glad tidings that Hasan and Husain are the chiefs of the Paradise. I said: Their father is superior than them"
Dailami, Firduas Al-Akhbar, V.5, page 76; Muttaqi Hindi, Kanz al-Ummal, V.12, page 122; Ibn Hajar al-Asqalani, Zahr al-Firdaus, V.4, page 134.