وَحَدَّثَنِي مَالِكٌ، عَنْ يَحْيَى بْنِ سَعِيدٍ، أَنَّ سَعِيدَ بْنَ الْمُسَيَّبِ، كَانَ يَقُولُ إِذَا دَبَّرَ الرَّجُلُ جَارِيَتَهُ فَإِنَّ لَهُ أَنْ يَطَأَهَا وَلَيْسَ لَهُ أَنْ يَبِيعَهَا وَلاَ يَهَبَهَا وَوَلَدُهَا بِمَنْزِلَتِهَا ‏.‏

Malik related to me from Yahya ibn Said that Said ibn al-Musayyabused to say, "When a man makes his slave-girl mudabbara, he can haveintercourse with her. He cannot sell her or give her away and herchildren are in the same position as her." Translation Not Available

Book Ref: Muwatta Imam Malik Book 40 Hadith 1501
Web Ref:  Muwatta Imam Malik Book 40 Hadith 5