Whenever Ibn `Umar 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."
Reference: Sahih al-Bukhari 5285 In-book : Book 68, Hadith 34 USC-MSA web (English) : Vol. 7, Book 63, Hadith 209 (deprecated)
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