´It was narrated that Simak bin Harb said:` “I heard Jabir bin Samurah say: ‘The Messenger of Allah (ﷺ) used to deliver the sermon standing, but he used to sit down briefly, then stand up.’”
Hadith ReferenceSunan Ibn Majah / Establishing the Prayer and the Sunnah Regarding Them / Hadith: 1105
Hadith Gradingالألبانی:صحيح | زبیر علی زئی:صحيح مسلم