وَلَا تَنكِحُوا الْمُشْرِكَاتِ حَتَّى يُؤْمِنَّ وَلَأَمَةٌ مُّؤْمِنَةٌ خَيْرٌ مِّن مُّشْرِكَةٍ وَلَوْ أَعْجَبَتْكُمْ وَلَا تُنكِحُوا الْمُشْرِكِينَ حَتَّى يُؤْمِنُوا وَلَعَبْدٌ مُّؤْمِنٌ خَيْرٌ مِّن مُّشْرِكٍ وَلَوْ أَعْجَبَكُمْ أُولَئِكَ يَدْعُونَ إِلَى النَّارِ وَاللَّهُ يَدْعُو إِلَى الْجَنَّةِ وَالْمَغْفِرَةِ بِإِذْنِهِ وَيُبَيِّنُ آيَاتِهِ لِلنَّاسِ لَعَلَّهُمْ يَتَذَكَّرُونَ
Do not marry idolatresses until they embrace faith. A faithful slave girl is better than an idolatress, though she should impress you. And do not marry [your daughters] to idolaters until they embrace faith. A faithful slave is better than an idolater, though he should impress you. Those invite [others] to the Fire, but Allah invites to paradise and pardon, by His will, and He clarifies His signs for the people so that they may take admonition.
Agha Ali Puya Commentary
Commentary on Quran 2:221
[Pooya/Ali Commentary 2:221] Inter-marriage between the believers in God and the idolaters has also been prohibited by Tawrat and Injil. You must not intermarry with them, neither giving your daughters to their sons nor taking their daughters for your sons; if you do, they will draw your sons away from the Lord and make them worship other gods. (Deut 7: 3 and 4) Do not unite yourselves with unbelievers; they are no fit mates for you. What has righteousness to do with wickedness? Can light consort with darkness? ( 2 Corinthians 6: 14) According to verse 21 of al Rum, Allah created for us from ourselves spouses that we may find repose in them, and caused between us love and compassion, therefore, spiritual affinity is essential between two life-partners, which is not possible if one believes in Allah and the other is an infidel who, spiritually and intellectually, is on the animal level, caught in the cobweb of falsehood, wickedness and mental retardness. It would be an unholy alliance. The infidel partner may draw the faithful away from the Lord and make him or her worship the imaginary deities and false gods. More often than not the children are affected by the conflicting beliefs of the parents. The risk is quite unnecessary, because any adverse response will lead directly to hell. The school of Ahl ul Bayt, in view of verse 5 of al Ma-idah, allows temporary marriage with the women of those who received the scriptures. (See books of Fiqh for details about marriage between the various schools of thought.)