Yahya related to me from Malik from Ibn Shihab from Abu Abd ar- Rahman that Zayd ibn Thabit said that if a man divorced his slave-girl three times and then bought her, she was not halal for him until she had married another husband.
أَنَّهُ كَانَ يَقُولُ فِي الرَّجُلِ يُطَلِّقُ الأَمَةَ ثَلاَثًا ثُمَّ يَشْتَرِيهَا إِنَّهَا لاَ تَحِلُّ لَهُ حَتَّى تَنْكِحَ زَوْجًا غَيْرَهُ
[Machine] He used to say about a man who divorces a slave woman three times and then buys her back, that she is not lawful for him until she marries another husband. I heard Malik saying that this is the opinion of more than one companion of the Prophet ﷺ.
أَنَّهُ كَانَ يَقُولُ فِي الرَّجُلِ يُطَلِّقُ الْأَمَةَ ثَلَاثًا ثُمَّ يَشْتَرِيهَا أَنَّهَا لَا تَحِلُّ لَهُ حَتَّى تَنْكِحَ زَوْجًا غَيْرَهُ قَالَ وَسَمِعْتُ مَالِكًا يَقُولُ قَالَ ذَلِكَ غَيْرُ وَاحِدٍ مِنْ أَصْحَابِ النَّبِيِّ ﷺ
"إذا كانتِ الأمَةُ تَحتَ الرَّجُلِ فطلَّقها تطليقتينِ، ثُم اشْتَراها لمْ تَحِل له حتَّى تنْكِحَ زوْجًا غيرَهُ".
"عَنْ زَيْدِ بْنِ ثَابِتٍ فِى الأَمَةِ يُطَلِّقهَا زَوْجُهَا الْبَتَّةَ ثُمَّ يَشْترِيهَا أَنَّهُ لَا تَحِلُّ لَهُ حَتَّى تَنْكِحَ زَوْجًا غَيْرَهُ".