A routine municipal ceremony has become seeped in controversy after a Brooklyn Civil Court judge was sworn in using a Koran.

Carolyn Walker-Diallo, who was elected last month in Brooklyn’s 7th Municipal District, took her oath of office Thursday using the holy book of Islam as a testament to her Muslim faith.

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There is no requirement that an officeholder swear on a specific religious text, or any text at all.

Walker-Diallo is not the first officeholder to be sworn in on the Koran: In 2006, Minnesota Rep. U.S. Keith Ellison did so.