By Allah
Encyclopedia
By Allah is Arabic expression meaning "[I promise
Promise
A promise is a commitment by someone to do or not do something.In the law of contract, an exchange of promises is usually held to be legally enforceable, according to the Latin maxim pacta sunt servanda.- Types :...

] by God"
used to make a promise or express great credibility on an expression. It is considered a sin among Muslim
Muslim
A Muslim, also spelled Moslem, is an adherent of Islam, a monotheistic, Abrahamic religion based on the Quran, which Muslims consider the verbatim word of God as revealed to prophet Muhammad. "Muslim" is the Arabic term for "submitter" .Muslims believe that God is one and incomparable...

 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 Wallaahi, "By my God", often contracted by non-Arab populations in Africa to Wallai.

Another meaning is "Really?", "Is that so?" (referring to "Do you swear on it?", used in spoken Arabic), "By God!" (this meaning has been adopted by Modern Hebrew
Modern Hebrew
Modern Hebrew , also known as Israeli Hebrew or Modern Israeli Hebrew, is the language spoken in Israel and in some Jewish communities worldwide, from the early 20th century to the present....

 slang
Slang
Slang is the use of informal words and expressions that are not considered standard in the speaker's language or dialect but are considered more acceptable when used socially. Slang is often to be found in areas of the lexicon that refer to things considered taboo...

 as well).

The word also found its way into the Serbian language
Serbian language
Serbian is a form of Serbo-Croatian, a South Slavic language, spoken by Serbs in Serbia, Bosnia and Herzegovina, Montenegro, Croatia and neighbouring countries....

 (вала, vala), presumably via Ottoman Turkish
Ottoman Turkish language
The Ottoman Turkish language or Ottoman language is the variety of the Turkish language that was used for administrative and literary purposes in the Ottoman Empire. It borrows extensively from Arabic and Persian, and was written in a variant of the Perso-Arabic script...

 during the period of Ottoman occupation
History of Ottoman Serbia
The territory of what is now the Republic of Serbia was part of the Ottoman Empire throughout the Early Modern period.Ottoman culture significantly influenced the region, in architecture, cuisine, linguistics, and dress, especially in arts, and Islam....

.
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