Concept:The first Friday congregational prayer (Jumu'ah) was held during the Prophet's migration to Madinah.Explanation:The Prophet left Makkah for Madinah in 1 A.H., which corresponds to 622 C.E.On the way, at the valley of Ranuna in the settlement of Banu Salim, the time for Friday prayer came.There, the Prophet led the Muslims in the first Friday congregational salat.This event took place in 622 C.E.Answer:A. 622 C.E.