Sahih Al Bukhari – Book of Divorce

Volumn 007, Book 063, Hadith Number 209.
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Narated By Nafi'RA : Whenever Ibn 'Umar RA was asked about marrying a Christian lady or a Jewess, he would say: "Allah has made it unlawful for the believers to marry ladies who ascribe partners in worship to Allah, and I do not know of a greater thing, as regards to ascribing partners in worship, etc. to Allah, than that a lady should say that Jesus is her Lord although he is just one of Allah's slaves."

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