Sahih al-Bukhari 5285
صحيح البخاري#5285Sahihحَدَّثَنَا قُتَيْبَةُ، حَدَّثَنَا لَيْثٌ، عَنْ نَافِعٍ، أَنَّ ابْنَ عُمَرَ، كَانَ إِذَا سُئِلَ عَنْ نِكَاحِ النَّصْرَانِيَّةِ، وَالْيَهُودِيَّةِ، قَالَ إِنَّ اللَّهَ حَرَّمَ الْمُشْرِكَاتِ عَلَى الْمُؤْمِنِينَ، وَلاَ أَعْلَمُ مِنَ الإِشْرَاكِ شَيْئًا أَكْبَرَ مِنْ أَنْ تَقُولَ الْمَرْأَةُ رَبُّهَا عِيسَى، وَهْوَ عَبْدٌ مِنْ عِبَادِ اللَّهِ.
Narrated Nafi`: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
Scholarly Authentication
The label above is the grade most of these scholars gave — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. Each scholar's own wording:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 68:34