At the age of 40, Muhammad received his call to become a prophet. He received the word of God through the Angel Gabriel and the divine message was recorded in the Holy Qur'an.
The God that spoke to Muhammad was the God of Abraham. Islam is thus essentially part of the great monotheistic movement that emerged and developed in the Near East. In Muhammad, regarded as the "seal of the prophets", the message of God for man was finally comprehended and Islam (submission to the will of Allah) is seen by Muslims as the apotheosis of the Judaeo-Christian tradition.
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