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.
bayhaqi:13985Sufyān > Yazīd b. Abū Ziyād > Zayd b. And Hb

[Machine] Umar ibn Al-Khattab wrote to him that the Muslim man can marry a Christian woman, but the Christian man cannot marry a Muslim woman.  

البيهقي:١٣٩٨٥وَبِهَذَا الْإِسْنَادِ حَدَّثَنَا سُفْيَانُ ثنا يَزِيدُ بْنُ أَبِي زِيَادٍ قَالَ سَمِعْتُ زَيْدَ بْنَ وَهْبٍ قَالَ

كَتَبَ إِلَيْهِ عُمَرُ بْنُ الْخَطَّابِ إِنَّ الْمُسْلِمَ يَنْكِحُ النَّصْرَانِيَّةَ وَلَا يَنْكِحُ النَّصْرَانِيُّ الْمُسْلِمَةَ