It is narrated from Sayyiduna Sa’ib bin Yazid that in the blessed era of the Prophet (ﷺ) and Sayyiduna Abu Bakr As-Siddiq, there was no custom of delivering sermons. The first person to deliver sermons was Sayyiduna Tamim Dari. He sought permission from Sayyiduna Umar to stand among the people and deliver sermons, and Sayyiduna Umar granted him permission.
Hadith Referenceمسند احمد / مسند المكيين / 15715
Hadith Gradingحکم دارالسلام:إسناده ضعيف، بقية لم يصرح بالسماع فى كل طبقات الرواة