A call to prayer is a concept found in many religions of a signal conveyed to members of the religion indicating that it is time to engage in a scheduled prayer ritual.
Muslim daily life is punctuated with five ritual prayers, or salat. In the early Muslim community in Madinah, according to tradition, faithful Muslims would gather around the Prophet Muhammad without any summons. The Prophet considered using a horn, as did the Jews to call the community to prayers, as well as a wooden gong, as the Eastern Christians did. One of his followers had a vision in a dream, however, in which a man taught him a better way to call people to prayer, saying, in translation:
God is most Great! God is most Great!
God is most Great! God is most Great!
I bear witness that there is no God but Allah.