The prayer on the two Eids used to be performed before the sermon.
كانت الصلاة في العيدين قبل الخطبة.
No references are available.
Ahmad bin Mani narrated it, he said, Yazid told us, Humayd told us, from Anas, and he related it.Al-Hafiz mentioned it in al-Matalib (789), and Busiri in al-Ittihaf (2229), and he said, "Ahmad bin Mani narrated it with a sahih chain of transmission."