Allah_ there is no god but Allah_ the Ever-Living_ the Ever-Sustaining.

The phrase you've mentioned is a declaration of faith known as the Shahada in Islam. It is one of the Five Pillars of Islam and is considered the central creedal statement in Islam, affirming the oneness of Allah (God) and the prophethood of Muhammad.

The full Shahada is as follows:

"La ilaha illallah, Muhammadur rasulullah."

This translates to:

"There is no god but Allah, Muhammad is the messenger of Allah."

The phrase emphasizes the monotheistic belief in the absolute oneness of Allah and the acceptance of Muhammad as His final messenger. It is recited by Muslims as an expression of their faith and commitment to Islam.