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http://en.wikipedia.org/wiki/Mosque

Mosque in Islamic texts

The word "masjid" is found throughout the Qur'an, most frequently with the reference to the sanctuary of Kaaba in the city of Mecca.

The First Mosques

According to Islamic beliefs, the first mosque in the world was the Kaaba, which was built by Abraham upon an order from God. The oldest Islamic-built mosque is the Quba Mosque in Medina. When Muhammad lived in Mecca, he viewed Kaaba as his first and principal mosque and performed prayers there together with his followers. Even during times when the pagan Arabs performed their rituals inside the Kaaba, Muhammad always held the Kaaba in very high esteem. The Meccan tribe of Quraish, which was responsible for guarding Kaaba, attempted to exclude Muhammad's followers from the sanctuary, which became a subject of Muslim complaints recorded in the Qur'an. When Muhammad conquered Mecca in 630, he converted Kaaba to a mosque, which has since become known as the Masjid al-Haram, or Sacred Mosque.