It is narrated from Sayyiduna Ibn Abbas (may Allah be pleased with them both) that once the Prophet (peace and blessings be upon him) went out (to lead the prayer for rain) in such a manner that he was displaying humility, submissiveness, and supplication, without any adornment, walking slowly and with dignity. He (peace and blessings be upon him) led the people in two rak‘ahs as he would on Eid, but he did not deliver a sermon as you do.