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

لِأَنَّ اللهَ تَعَالَى يَقُولُ مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ  

[Machine] About Al-Hasan's saying, "And whoever among you cannot [find] the means to marry free, believing women" [Quran 4:25], until his saying, "from your believing slave girls" [Quran 4:25], he said, "So we were not granted permission regarding the slave women of the People of the Book."  

عَنِ الْحَسَنِ فِي قَوْلِهِ تَعَالَى {وَمَنْ لَمْ يَسْتَطِعْ مِنْكُمْ طَوْلًا} [النساء 25] إِلَى قَوْلِهِ {مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ} [النساء 25] قَالَ فَلَمْ يُرَخِّصْ لَنَا فِي إِمَاءِ أَهْلِ الْكِتَابِ  

[Machine] "And they used to say that it is not permissible for a Muslim to marry a Jewish or Christian woman, but Allah has made lawful for them the chaste women from among those who were given the Scripture, and not prohibited are the believers from marrying them."  

وَكَانُوا يَقُولُونَ لَا يَصْلُحُ لِلْمُسْلِمِ نِكَاحُ الْأَمَةِ الْيَهُودِيَّةِ وَلَا النَّصْرَانِيَّةِ إِنَّمَا أَحَلَّ اللهُ الْمُحْصَنَاتِ مِنَ الذِّينَ أُوتُوا الْكِتَابَ وَلَيْسَتِ الْأَمَةُ بِمُحْصَنَةٍ