Muwatta Malik #1611
The Mudabbar
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
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-Musayyab
used to say, "When a man makes his slave-girl mudabbara, he can have
intercourse with her. He cannot sell her or give her away and her
children are in the same position as her."
About Muwatta Malik
This hadith is #1611 from Muwatta Malik, in the Book of The Mudabbar.