Musnad Ahmad 4:6

'Abdullah narrated to us, Surayj ibn Yunus narrated to me, Mahbub ibn Muhriz—the glass seller, a trustworthy Kufan, as Surayj said—narrated to us, from Ibrahim ibn 'Abdullah—meaning Ibn Farrukh—from his father, who said: I prayed the 'Eid prayer behind 'Uthman, and he recited seven takbirs and five.