It is narrated from Ata (may Allah have mercy on him) that when the Messenger of Allah (peace be upon him) delivered a sermon, he would stand leaning firmly on a spear.
Hadith Referenceمسند الإمام الشافعي / كتاب العيدين والأضاحي والاستسقاء / 498
Hadith Takhrijاسنادہ ضعیف، لضعف شیخ الشافعی، ولضعف لیث بن ابی سلیم ولإرسالہ، اخرجـہ البیہقی فی معرفۃ السنن والآثار (1924)۔
Ubaydullah bin Abdullah bin Utbah narrates that the Sunnah method is that the Imam delivers two sermons in the Eid prayers and separates them by sitting in between.
Hadith Referenceمسند الإمام الشافعي / كتاب العيدين والأضاحي والاستسقاء / 499