the case of a man who had intercourse with the slave woman of his wife was referred to the Messenger of Allah ﷺ, and he did not stipulate any legal punishment for him. (Using translation from Ibn Mājah 2552)  

«أَنَّ رَسُولَ اللهِ ﷺ رُفِعَ إِلَيْهِ رَجُلٌ وَطِئَ جَارِيَةَ امْرَأَتِهِ فَلَمْ يُحِدَّهُ»  

[Machine] A man went on a raid and took with him a slave girl belonging to his wife. Something happened to her, and this was mentioned to the Prophet Muhammad ﷺ . He said, "If he forced her, then she is free and he must give her an equal in compensation. And if she willingly accepted it, then she is a slave and he must give an equal in compensation."  

أَنَّ رَجُلًا خَرَجَ فِي غَزَاةٍ وَمَعَهُ جَارِيَةٌ لِامْرَأَتِهِ فَوَقَعَ عَلَيْهَا فَذُكِرَ ذَلِكَ لِلنَّبِيِّ ﷺ فَقَالَ «إِنْ كَانَ اسْتَكْرَهَهَا فَهِيَ حُرَّةٌ وَعَلَيْهِ لَهَا مَثْلُهَا وَإِنْ كَانَتْ طَاوَعَتْهُ فَهِيَ أَمَةٌ وَعَلَيْهِ مَثْلُهَا لَهَا»  

"If he forced her, then she is free at his expense and he has to give her mistress a similar slave as a replacement. If she obeyed him in that, then she belongs to her mistress, and he has to give her mistress a similar slave as well." (Using translation from Nasāʾī 3364)  

أَنَّ رَجُلًا غَشِيَ جَارِيَةَ امْرَأَتِهِ فَرُفِعَ ذَلِكَ إِلَى رَسُولِ اللهِ ﷺ فَقَالَ «إِنْ كَانَ اسْتَكْرَهَهَا فَهِيَ حُرَّةٌ مِنْ مَالِهِ وَعَلَيْهِ الشَّرْوَى لِسَيِّدَتِهَا وَإِنْ كَانَتْ طَاوَعَتْهُ فَهِيَ لِسَيِّدَتِهَا وَمِثْلُهَا مِنْ مَالَهُ»  

The Messenger of Allah ﷺ made a decision about a man who had intercourse with his wife's slave-girl as follows. If he forced her, she is free, and he shall give her mistress a slave-girl similar to her; if she asked him to have intercourse voluntarily, she will belong to him, and he shall give her mistress a slave-girl similar to her. Abu Dawud said: This tradition has been transmitted by Yunus b. 'Ubaid, 'Amr b. Dinar, Mansur b. Zadhan and Salam from al-Hasan to the same effect. But yunus and Mansur did not mention Qabisah. (Using translation from Abū Dāʾūd 4460)   

قَضَى النَّبِيُّ ﷺ فِي رَجُلٍ وَطِئَ جَارِيَةِ امْرَأَتِهِ «إِنْ كَانَ اسْتَكْرَهَهَا فَهِيَ حُرَّةٌ وَعَلَيْهِ لِسَيِّدَتِهَا مَثْلُهَا وَإِنْ كَانَتْ طَاوَعَتْهُ فَهِيَ لَهُ وَعَلَيْهِ لِسَيِّدَتِهَا مَثْلُهَا» قَالَ أَبُو عَبْدِ الرَّحْمَنِ لَيْسَ فِي هَذَا الْبَابِ شَيْءٌ صَحِيحٌ يُحْتَجُّ بِهِ