The athan is the first Islamic call to prayer, usually recited by a muezzin at five times of the day in a mosque, traditionally from a minaret. The adhan is also the first thing recited in the ear of a newborn baby. Its often the first thing recited in a new home.
The announcer of the Adhan is called a "Muezzin" (miniature depicting Bilal ibn Rabah the first Muezzin).
photo of kalima at Bab al-Nasr of Shia Fatimid dynasty of Cairo with phrase ʿalīyun walīyu -llāh
The qiblah of Mustansir of Shia Fatimid dynasty of, in Mosque of Ibn Tulun of Cairo showing Kalimat ash-shahādah with the phrase ʿalīyun walīyu -llāh
Islam is an Abrahamic monotheistic religion centered on the Quran and the teachings of Muhammad, the religion's founder. Adherents of Islam are called Muslims, who are estimated to number approximately 1.9 billion worldwide and are the world's second-largest religious population after Christians.
The Kaaba at Masjid al-Haram in Mecca, Saudi Arabia, the holiest Islamic site
Calligraphy showing the word Allah in Arabic in Hagia Sophia, Istanbul, Turkey
A 16th century Siyer-i Nebi image of the angel Gabriel visiting Muhammad
A Quran manuscript resting on a rehal, a book rest for the holy text
