Musnad Ahmad 1153:424

Musa ibn Dawud narrated to us, Ibn Abi al-Zinad narrated to us, from his father, from Urwah, from Aisha, that the Messenger of Allah (may Allah bless him and grant him peace) placed a pulpit in the mosque for Hassan to defend him with poetry. Then the Messenger of Allah (may Allah bless him and grant him peace) would say: "Indeed, Allah the Almighty and Majestic supports Hassan with the Holy Spirit, as he defends the Messenger of Allah (may Allah bless him and grant him peace)."