A hafiz who is not a Molvi, gives bayaans before the Jumuah Khutbah on the subject of Islaah of the Nafs.

Answer

It is haraam for a jaahil to stand up in the Musjid to give a bayaan. His bloated nafs impels him to create an image of Ilm for himself. He prepares his abode in Jahannam with his nafsaani bayaans. A layman may not deliver bayaans to the public.

The Hadith prohibits laymen from giving lectures. This chap will most assuredly mislead other juhala. It is mentioned in the Hadith that in the era close to Qiyaamah, the jaahil will issue fatwas to the juhala masses and all of them will be astray.