It wasnarrated that Simak bin Harb said:
"I heard Jabir bin Samurahsay:'The Messenger of Allah (ﷺ) used to deliver the sermonstanding,but he used to sit down briefly, then stand up.'" (ES)
English reference (ES): Vol. 1, Book 5, Hadith 1105 (ES)
Arabic reference (ES): Book 5, Hadith 1159 (ES)