'Abdur-Rahman bin Sa'd bin 'Ammar bin Sa'd narrated that hisfathertold him, from his father, from his grandfather, that when theMessenger of Allah (ﷺ) delivered a speech on the battlefield hewould do so leaning on a bow, and when he delivered a sermon onFriday, he would do so leaning on his staff.
English reference: Vol. 1, Book 5, Hadith 1107
Arabic reference: Book 5, Hadith 1161