Quran

 4:25

وَمَنْ لَمْ يَسْتَطِعْ مِنْكُمْ طَوْلًا أَنْ يَنْكِحَ الْمُحْصَنَاتِ الْمُؤْمِنَاتِ فَمِنْ مَا مَلَكَتْ أَيْمَانُكُمْ مِنْ فَتَيَاتِكُمُ الْمُؤْمِنَاتِ ۚ وَاللَّهُ أَعْلَمُ بِإِيمَانِكُمْ ۚ بَعْضُكُمْ مِنْ بَعْضٍ ۚ فَانْكِحُوهُنَّ بِإِذْنِ أَهْلِهِنَّ وَآتُوهُنَّ أُجُورَهُنَّ بِالْمَعْرُوفِ مُحْصَنَاتٍ غَيْرَ مُسَافِحَاتٍ وَلَا مُتَّخِذَاتِ أَخْدَانٍ ۚ فَإِذَا أُحْصِنَّ فَإِنْ أَتَيْنَ بِفَاحِشَةٍ فَعَلَيْهِنَّ نِصْفُ مَا عَلَى الْمُحْصَنَاتِ مِنَ الْعَذَابِ ۚ ذَٰلِكَ لِمَنْ خَشِيَ الْعَنَتَ مِنْكُمْ ۚ وَأَنْ تَصْبِرُوا خَيْرٌ لَكُمْ ۗ وَاللَّهُ غَفُورٌ رَحِيمٌ ﴿٢٥﴾

25. If any of you lacks the means to marry free believing women, he may marry one of the believing maids under your control. Allah knows all about your faith. You are from one another. Marry them with the consent of their guardians, and give them their rightful compensations—to be protected—neither committing adultery nor taking secret lovers. When they are married, if they commit adultery, their punishment shall be half that of free women. That is for those among you who fear falling into decadence. But to practice self-control is better for you. Allah is Most Forgiving, Most Merciful.