(229) باب الْجُلُوسِ إِذَا صَعِدَ الْمِنْبَرَ
Ibn 'Umar said:
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 reference: Book 2, Hadith 703
English translation: Book 2, Hadith 1087