Musnad Ahmad 25:715

'Abdullah ibn al-Walid narrated to us, Sufyan narrated to us, from Ibn Jurayj, from al-Hasan ibn Muslim, from Tawus, from Ibn 'Abbas, who said: "The Messenger of Allah (ﷺ) prayed, then he delivered a sermon, and Abu Bakr, and 'Umar, and 'Uthman [did the same] on the 'Eid without an Adhan and without an Iqamah." My father said: "'Abdullah heard it."