Nafi' narrates from Sayyiduna Ibn Umar (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him), Sayyiduna Abu Bakr (may Allah be pleased with him) and Sayyiduna Umar (may Allah be pleased with him) used to lead the prayer before the sermon.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6201