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Surah 2. Al-Baqara
Ayah 221
221 وَلَا تَنكِحُوا۟ ٱلْمُشْرِكَـٰتِ حَتَّىٰ يُؤْمِنَّ ۚ وَلَأَمَةٌ مُّؤْمِنَةٌ خَيْرٌ مِّن مُّشْرِكَةٍ وَلَوْ أَعْجَبَتْكُمْ ۗ وَلَا تُنكِحُوا۟ ٱلْمُشْرِكِينَ حَتَّىٰ يُؤْمِنُوا۟ ۚ وَلَعَبْدٌ مُّؤْمِنٌ خَيْرٌ مِّن مُّشْرِكٍ وَلَوْ أَعْجَبَكُمْ ۗ أُو۟لَـٰٓئِكَ يَدْعُونَ إِلَى ٱلنَّارِ ۖ وَٱللَّهُ يَدْعُوٓا۟ إِلَى ٱلْجَنَّةِ وَٱلْمَغْفِرَةِ بِإِذْنِهِۦ ۖ وَيُبَيِّنُ ءَايَـٰتِهِۦ لِلنَّاسِ لَعَلَّهُمْ يَتَذَكَّرُونَ
[221] Do not marry mushrik women unless they believe; a slave woman who believes is better than a free woman who does not believe, even though the latter may appear very attractive to you. (Likewise) do not wed your women to mushrik men unless they believe; a slave man who believes is better than a free man who does not, even though he may be very pleasing to you. These mushrik people invite you to the Fire237 while Allah by His grace invites you to the Garden and His pardon, and He makes His revelations plain to the people so that they should learn a lesson and follow the admonition.
237The reason why the believers have been prohibited from marrying musrhik spouses is that `they invite you to the Fire'. This means that such marriage might mislead the Muslim spouses to the ways of shirk, for the relations between husband and wife are not merely sexual but spiritual and cultural as well. It is possible that the Muslim spouse may influence the mushrik spouse and his or her family and their offspring in favour of the Islamic way of life. But it is equally possible that the mushrik spouse may imbue the Muslim spouse, his (or her) family or their offspring, with the spirit and ways of shirk. Most probably as a result of such a marriage, a mixture of Islam and un-Islam will be bred in such a family. A non-Muslim might approve of this, but a Muslim cannot. One who sincerely believes in Islam can never take such a risk merely for the sake of the gratification of his lust. He would rather suppress his passions than do anything that might mislead him to disbelief, blasphemy and shirk or, at least mislead his progeny.