Ibn 'Umar said that the Messenger of Allah (ﷺ) used to deliver the sermon on Friday while standing. He would then sit and then stand (for the second sermon) as they (the Muslims) do nowadays.
Reference: Sahih Muslim 861 In-book : Book 7, Hadith 44 USC-MSA web (English) : Book 4, Hadith 1874 (deprecated)
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