Concept: The first Friday congregational prayer in Islam was established during the early period of the Prophet's time in Madinah.Explanation:The first Friday congregation salat was held after the Hijrah to Madinah.It took place in the year 624 C.E.This was during the second year after the migration.The Prophet Muhammad (peace be upon him) led this first Jumu'ah prayer.Answer:624 C.E.