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.
كَانَ رَسُولُ اللَّهِ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ قَائِمًا ثُمَّ يَجْلِسُ ثُمَّ يَقُومُ قَالَ كَمَا يَفْعَلُونَ الْيَوْمَ
[Machine] About the Prophet ﷺ , it is narrated that he used to deliver the sermon standing on the day of Friday, then he would sit, and then he would stand and deliver the sermon.
عَنِ النَّبِيِّ ﷺ أَنَّهُ كَانَ يَخْطُبُ يَوْمَ الْجُمُعَةِ قَائِمًا ثُمَّ يَقْعُدُ ثُمَّ يَقُومُ فَيَخْطُبُ
[Machine] The Messenger of Allah ﷺ used to deliver the Friday sermon while standing, then he would sit, and then he would stand again.
كَانَ رَسُولُ اللهِ ﷺ يَخْطُبُ يَوْمَ الْجُمُعَةِ قَائِمًا ثُمَّ يَقْعُدُ ثُمَّ يَقُومُ
[Machine] The Messenger of Allah ﷺ used to give the sermon on Fridays standing, then he would sit down, then he would stand and give the sermon.
كَانَ رَسُولُ اللهِ ﷺ «يَخْطُبُ يَوْمَ الْجُمُعَةِ قَائِمًا ثُمَّ يَجْلِسُ ثُمَّ يَقُومُ فَيَخْطُبُ»
"أَن النَّبِىَّ ﷺ كانَ يَخْطُبُ يَوْمَ الْجُمُعَةِ قَائِمًا، ثُمَّ يَقْعُدُ، ثُمَّ يَقُومُ فَيَخْطُبُ".