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In page Islamic marital practices:

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Nikah 'urfi is a "customary" marriage contract that commonly requires a Wali (Islamic legal guardian) and witnesses but is not officially registered with state authorities. Usually a written statement that the two are married, is signed by the couple and at least two witnesses, although a cassette tape with a recording of their commitment may be used as documentation.[citation needed][1] 'Urfi marriages are sometimes performed with no witnesses, but scholars consider such marriages to be “nikah faasid”—a corrupt or invalid marriage.[2]