Musnad Ahmad 30:3633

'Abd al-Samad narrated to us, Hammad narrated to us, 'Ali ibn Zayd narrated to me, [and] one who heard Abu Hurayrah informed me, saying: I heard the Messenger of Allah, may Allah bless him and grant him peace, saying: "A tyrant from the tyrants of the Banu Umayya will surely have a nosebleed upon my pulpit, and his nosebleed will flow." He said: Then one who saw 'Amr ibn Sa'id ibn al-'As told me that he had a nosebleed upon the pulpit of the Messenger of Allah, may Allah bless him and grant him peace, until his nosebleed flowed.