The Prophet ﷺ used to deliver the Khutba while standing and then he would sit, then stand again as you do now-a-days.  

كَانَ النَّبِيُّ ﷺ يَخْطُبُ قَائِمًا ثُمَّ يَقْعُدُ ثُمَّ يَقُومُ كَمَا تَفْعَلُونَ الآنَ  

"I asked Jabir: 'Did the Messenger of Allah ﷺ deliver the Khutbah standing?' He said: 'The Messenger of Allah ﷺ used to deliver the Khutbah standing, then he would sit for a while, then stand up again.'"  

سَأَلْتُ جَابِرًا أَكَانَ رَسُولُ اللَّهِ ﷺ يَخْطُبُ قَائِمًا قَالَ كَانَ رَسُولُ اللَّهِ ﷺ يَخْطُبُ قَائِمًا ثُمَّ يَقْعُدُ قَعْدَةً ثُمَّ يَقُومُ  

“The Messenger of Allah ﷺ went out on the Day of Al-Fitr or Al-Adha, and delivered a sermon standing up. Then he sat down briefly, then stood up again.”  

خَرَجَ رَسُولُ اللَّهِ ﷺ يَوْمَ فِطْرٍ أَوْ أَضْحًى فَخَطَبَ قَائِمًا ثُمَّ قَعَدَ قَعْدَةً ثُمَّ قَامَ  

[Machine] I asked Jabir ibn Samurah how the Prophet ﷺ used to deliver speeches. He replied, "He ﷺ would deliver a sermon, then sit for a while, and then stand up and deliver another sermon."  

سَأَلْتُ جَابِرَ بْنَ سَمُرَةَ كَيْفَ كَانَ النَّبِيُّ ﷺ يَخْطُبُ؟ قَالَ «كَانَ ﷺ يَخْطُبُ ثُمَّ يَقْعُدُ قَعْدَةً ثُمَّ يَقُومُ فَيَخْطُبُ»  

[Machine] About the sermon of the Prophet ﷺ, he said, "He used to deliver the sermon while standing, then he would sit for a while, and then he would stand again."  

عَنْ خِطْبَةِ النَّبِيِّ ﷺ فَقَالَ «كَانَ يَخْطُبُ قَائِمًا ثُمَّ يَقْعُدُ قَعْدَةً ثُمَّ يَقُومُ»  

[Machine] "That the Prophet ﷺ delivered a sermon while standing and then sat down."  

«أَنَّ النَّبِيَّ ﷺ خَطَبَ قَائِمًا ثُمَّ قَعَدَ»  

"I asked Jabir: 'Did the Messenger of Allah ﷺ deliver the Khutbah standing?' He said: 'The Messenger of Allah ﷺ used to deliver the Khutbah standing, then he would sit for a while, then stand up again.'" (Using translation from Nasāʾī 1574)  

سَأَلْتُ جَابِرًا أَكَانَ رَسُولُ اللهِ ﷺ يَخْطُبُ قَائِمًا؟ فَقَالَ كَانَ رَسُولُ اللهِ ﷺ «يَخْطُبُ قَائِمًا ثُمَّ يَقْعُدُ قَعْدَةً ثُمَّ يَقُومُ»