Wallah (arabic)

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By Allah (Arabic: Wallah, والله) is Arabic expression meaning "[I promise] by God" used to make a promise or express great credibility on an expression. It is considered a sin among Muslim to use this phrase and follow it up with a lie. Also, some Muslims argue that this is one of the few valid ways of making a promise, the variant "I promise on myself" or "I promise on my own soul" not being allowed, in contrast to "I promise by the one who holds my soul" ie God. An alternative is Wallahi, "By my God".

It is the origin of the well known Spanish exclamation: ¡Olé!^{[citations needed]}