Musnad Ahmad 907:42

Yahya ibn Adam narrated to us, Abu al-Ahwas narrated to us, from Simak ibn Harb, from Jabir ibn Samurah, who said: "I prayed the two Eids with the Messenger of Allah, peace and blessings of Allah be upon him, not once, nor twice, without an Adhan or an Iqamah."