The obligation of praising Allah the Exalted and sending blessings upon His Messenger in the two Friday sermons

Question:
I prayed on Friday behind one of the young preachers. He began the first sermon with praise of Allah and sending blessings upon the Prophet (peace and blessings be upon him), then he suddenly ended it and sat down without concluding it with what preachers usually conclude their sermons with. Then he stood up for the second sermon and continued speaking about the topic he had started, without praising Allah or sending blessings upon the Prophet (peace and blessings be upon him), and he did not conclude it with sending blessings upon the Prophet (peace and blessings be upon him) or the supplication we usually hear from preachers. Instead, after he finished speaking about the topic he was discussing, he said: "Stand up for your prayer." We ask for clarification of the truth regarding what this preacher did, and whether the sermon has pillars? May Allah reward you with good.

Answer:
It is obligatory for the preacher on Friday, in each of the two sermons, to praise Allah, to send blessings upon His Messenger (peace and blessings be upon him), to testify that there is no god but Allah, and that Muhammad is His slave and His Messenger. Then he should admonish the people, remind them, and recite some verses. May Allah grant success.