The Arabic word illa is a negative word corresponding to the English except, only and but.
[1] It is an often recurring phrase in the Qur'an, often used to give strength to statements by first negating all possibilities, and then referring to a subject.
For example, in the Islamic Creed (Arabic: Shahada): This can also be seen in the prayer La hawla wa la quwwata illa billah, There is neither change nor power except by means of God.
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