Every Muslim is required to perform the Friday prayer coupled with the Friday sermon in Medan. As long as Muslims are still on the surface of the earth during that time, the Friday sermon will continue. Secondly, the implementation of the Friday sermon generally takes place simultaneously in every country if it is only a few hours apart. So the message in the Friday sermon can be disseminated throughout the Islamic world with uniform material. Thirdly, in terms of communication, the Friday sermon is a communication in one direction and communication from top to bottom. A preacher is not only a seat position higher than the congregation but also the message conveyed should not be interrupted during the sermon. the jamaah practice what the preacher preached was also influenced by the credibility of the preacher himself. So if the preacher is well known and pious, the possibility of jamaah to procatice it is higher than if the preacher is considered less credible.
Keywords: Friday sermon; mosques; preacher; jamaa
