It is narrated from Sayyiduna Abdullah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings of Allah be upon him) used to deliver two sermons while standing, and he would separate them by sitting in between.
Hadith Referenceصحيح ابن خزيمه / جماع أبواب صلاة العيدين، الفطر والأضحى، وما يحتاج فيهما من السنن / 1446