Hadith No: 2
Ibn Abi Shaybah - Al-Kitab al-Musannaf fi al-Ahadith wa al-Athar
Book of Virtues - What was narrated about Al-Hasan and Al-Husayn (peace be upon them)
Volume: (6) - Page Number: (378)
32177 - Zayd ibn Hubab narrated to us, from Isra'il, from Maysarah al-Nahdi, from al-Nu'man ibn Amr, from Zar ibn Habish, from Hudhayfah, who said: "I went to the Prophet (peace be upon him and his holy progeny) and prayed the Maghrib prayer with him. Then he stood up to pray and continued until he had prayed the Isha prayer. Then he came out, and I followed him.
He said: 'An angel appeared to me and asked my Lord for permission to greet me and give me the good news that Al-Hasan and Al-Husayn are the masters of the youth of the people of Paradise.'"