Bismillah

Webster's Dictionary

(interj.) An adjuration or exclamation common among the Mohammedans.

Cyclopedia of Biblical, Theological and Ecclesiastical Literature

(in the name of God) is a solemn form of words prefixed to every chapter of the Koran except the ninth. Mohammedan doctors are not agreed as to the inspiration of this phrase, some declaring it to be of divine origin, while others hold it to be the invention of men.