shahada

The Shahadah (Arabic: , from the verb "to testify") is the Islamic creed. The Shahadah is the Muslim declaration of belief in the oneness of God and acceptance of Muhammad as his final prophet. Recitation of the Shahadah is the most important of the Five Pillars of Islam for Muslims and is performed daily.
See more at Wikipedia.org...

The Shahada is the central Moslem statement of faith. It is short, but in two parts. The first is: "There is no god but Allah" (Arab. "La illahah illah 'lla"). The second is: "And Mohammed is his Prophet" (Arab. "Wah Mohammadan rasulu 'llah"). Saying the Shahada in Arabic with the intent of becoming a Moslem immediately makes a person a member of the Umma (i.e., the Islamic Community).