The Prophet (ﷺ) used to deliver two sermons. He would sit down when he ascended the pulpit till he (I think he meant the mu'adhdhin) finished. He would then stand up and preach, then sit down and say nothing, then stand up and preach.
Reference: Sunan Abi Dawud 1092 In-book : Book 2, Hadith 703 English translation : Book 2, Hadith 1087
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