Musannaf Ibn Abi Shaybah 5287 — Those who used to deliver the sermon

Tawus said: The Messenger of Allah (peace and blessings be upon him) delivered the sermon standing, Sayyiduna Abu Bakr (may Allah be pleased with him) delivered the sermon standing, Sayyiduna Umar (may Allah be pleased with him) delivered the sermon standing, and Sayyiduna Uthman (may Allah be pleased with him) delivered the sermon standing. The first who delivered the sermon sitting was Sayyiduna Mu'awiyah (may Allah be pleased with him).