Musannaf Ibn Abi Shayba 3:2818

Abu Bakr narrated to us, he said: Abu Usamah narrated to us, he said: Mujalid narrated to us, from al-Sha’bi, who said: When the Messenger of Allah (may Allah bless him and grant him peace) would ascend the pulpit on Friday, he would face the people with his face and say, "Peace be upon you." Then he would praise Allah and extol Him, and recite a Surah, then sit, then stand and deliver the sermon, then descend. And Abu Bakr and Umar used to do that.