وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ أَبَا نَهْشَلِ بْنَ الأَسْوَدِ، قَالَ لِلْقَاسِمِ بْنِ مُحَمَّدٍ إِنِّي رَأَيْتُ جَارِيَةً لِي مُنْكَشِفًا عَنْهَا وَهِيَ فِي الْقَمَرِ فَجَلَسْتُ مِنْهَا مَجْلِسَ الرَّجُلِ مِنِ امْرَأَتِهِ فَقَالَتْ إِنِّي حَائِضٌ فَقُمْتُ فَلَمْ أَقْرَبْهَا بَعْدُ أَفَأَهَبُهَا لاِبْنِي يَطَؤُهَا فَنَهَاهُ الْقَاسِمُ عَنْ ذَلِكَ ‏.‏

Yahya related to me from Malik from Yahya ibn Said that AbuNahshal ibn al-Aswad said to al-Qasim ibn Muhammad,"I saw a slave-girlof mine uncovered in the moonlight, and so I sat on her as a man sitson a woman. She said that she was menstruating, so I stood up and havenot gone near her after that. Can I give her to my son to haveintercourse with?" Al-Qasim forbade that. Translation Not Available

Book Ref: Muwatta Imam Malik Book 28 Hadith 1132
Web Ref:  Muwatta Imam Malik Book 28 Hadith 37