Musannaf Ibn Abi Shayba 27:539

Zayd ibn Hubab narrated to us, from Isra'il, from Maysarah al-Nahdi, from al-Nu'man ibn 'Amr, from Zirr ibn Hubaysh, from Hudhayfah, who said: I came to the Prophet, peace and blessings of Allah be upon him, and I prayed Maghrib with him. Then he stood to pray until he prayed Isha. Then he went out, and I followed him. He said: "An angel appeared to me, having sought permission from his Lord to greet me and to give me the glad tidings that al-Hasan and al-Husayn are the masters of the youth of the people of Paradise."