It is narrated from Hazrat Jabir (may Allah be pleased with him) that I saw the Prophet (peace and blessings be upon him) delivering the sermon while standing. Therefore, if anyone among you says that he saw the Prophet (peace and blessings be upon him) delivering the sermon while sitting, he is speaking falsely. Hazrat Jabir (may Allah be pleased with him) says that the Prophet’s (peace and blessings be upon him) sermon and prayer were moderate. Hazrat Jabir (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) would deliver two sermons: first, he would deliver one sermon and then sit down, then stand up and deliver the second sermon.
Hadith Referenceمسند احمد / أول مسند البصريين / 20873
Hadith Gradingحکم دارالسلام:صحيح لغيره، م: 862، وهذا إسناد صحيح