Abu Sa’id Al Khudri said “The Messenger of Allah(ﷺ) sent a military expedition to Awtas on the occasion of the battle of Hunain. They met their enemy and fought with them. They defeated them and took them captives. Some of the Companions of Apostle of Allaah (ﷺ) were reluctant to have relations with the female captives because of their pagan husbands. So, Allaah the exalted sent down the Qur’anic verse “And all married women (are forbidden) unto you save those (captives) whom your right hand posses.” This is to say that they are lawful for them when they complete their waiting period.
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ عُمَرَ بْنِ مَيْسَرَةَ، حَدَّثَنَا يَزِيدُ بْنُ زُرَيْعٍ، حَدَّثَنَا سَعِيدٌ، عَنْ قَتَادَةَ، عَنْ صَالِحٍ أَبِي الْخَلِيلِ، عَنْ أَبِي عَلْقَمَةَ الْهَاشِمِيِّ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم بَعَثَ يَوْمَ حُنَيْنٍ بَعْثًا إِلَى أَوْطَاسٍ فَلَقُوا عَدُوَّهُمْ فَقَاتَلُوهُمْ فَظَهَرُوا عَلَيْهِمْ وَأَصَابُوا لَهُمْ سَبَايَا فَكَأَنَّ أُنَاسًا مِنْ أَصْحَابِ رَسُولِ اللَّهِ صلى الله عليه وسلم تَحَرَّجُوا مِنْ غِشْيَانِهِنَّ مِنْ أَجْلِ أَزْوَاجِهِنَّ مِنَ الْمُشْرِكِينَ فَأَنْزَلَ اللَّهُ تَعَالَى فِي ذَلِكَ { وَالْمُحْصَنَاتُ مِنَ النِّسَاءِ إِلاَّ مَا مَلَكَتْ أَيْمَانُكُمْ } أَىْ فَهُنَّ لَهُمْ حَلاَلٌ إِذَا انْقَضَتْ عِدَّتُهُنَّ .
sunnah.com