The Jumu'ah (Friday) prayer is one form of congregational worship in Islam. It takes place every Friday. Regular attendance at the Jumu'ah prayer is enjoined on the believer. According to a Saying of Muhammad sa this congregational prayer is twenty-five times more blessed than worship performed alone.
Friday Sermons in the Quran
“O ye who believe! When the call is made for Prayer on Friday, hasten to the remembrance of Allah, and leave off all business. That is best for you, if you only knew.” more
Friday Sermons in the Hadith
“… (He who) offers the Prayers and listens quitely when the Imam stands up for sermon, will have his sins forgiven between that Friday and the next”