Jabir b. Samura said that the Messenger of Allah (ﷺ) used to deliver the sermon while standing. He would then sit down and then stand up and address in a standing posture; and whoever informed you that he (the Holy Prophet) delivered the sermon while sitting told a lie. By Allah. I prayed with him more than two thousand times.
Reference: Sahih Muslim 862 b In-book : Book 7, Hadith 46 USC-MSA web (English) : Book 4, Hadith 1876 (deprecated)
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