Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
Qurʾān Bukhārī Muslim Nasāʾī Abū Dāwūd Tirmidhī Ibn Mājah Mālik Aḥmad Dārimī Ḥākim Ibn Ḥibbān Ṭabarānī Nasāʾī's Kubrá Bayhaqī al-Luʾluʾ wa-al-Marjān Ibn Rajab's Fifty Riyāḍ al-Ṣāliḥīn Aḥmad's Zuhd Suyūṭī
bayhaqi:14012 – Abū Naṣr b. Qatādah > Abū Manṣūr al-Naḍrawī > Aḥmad b. Najdah > Saʿīd b. Manṣūr > Sufyān > Ibn Abū Najīḥ > Mujāhid > Lā Yaṣluḥ Nikāḥ Imāʾ Ahl al-Kitāb Liʾan Allāh Taʿālá

[Machine] Because Allah the Almighty says "among your believing women."  

البيهقي:١٤٠١٢ – أَخْبَرَنَا أَبُو نَصْرِ بْنُ قَتَادَةَ أنبأ أَبُو مَنْصُورٍ النَّضْرَوِيُّ ثنا أَحْمَدُ بْنُ نَجْدَةَ ثنا سَعِيدُ بْنُ مَنْصُورٍ ثنا سُفْيَانُ عَنِ ابْنِ أَبِي نَجِيحٍ عَنْ مُجَاهِدٍ قَالَ لَا يَصْلُحُ نِكَاحُ إِمَاءِ أَهْلِ الْكِتَابِ

لِأَنَّ اللهَ تَعَالَى يَقُولُ مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ