Muwatta Malik, Book 29, Hadith 51 (USC-MSA)

Yahya related to me from Malik from Nafi that Abdullah ibn Umar said, "If a man gives his slave permission to marry, the divorce is in the hand of the slave, and nobody else has any power over his divorce. Nothing is held against a man who takes the slave-girl of his male slave or the slave-girl of his female-slave."

وَحَدَّثَنِي عَنْ مَالِكٍ، عَنْ نَافِعٍ، أَنَّ عَبْدَ اللَّهِ بْنَ عُمَرَ، كَانَ يَقُولُ مَنْ أَذِنَ لِعَبْدِهِ أَنْ يَنْكِحَ فَالطَّلاَقُ بِيَدِ الْعَبْدِ لَيْسَ بِيَدِ غَيْرِهِ مِنْ طَلاَقِهِ شَىْءٌ فَأَمَّا أَنْ يَأْخُذَ الرَّجُلُ أَمَةَ غُلاَمِهِ أَوْ أَمَةَ وَلِيدَتِهِ فَلاَ جُنَاحَ عَلَيْهِ ‏.‏

sunnah.com

also referenced under: Book 29, Hadith 1211 (In-Book)

Malik said, "Neither a free man nor a slave who divorces a slave- girl nor a slave who divorces a free woman, in an irrevocable divorce, is obliged to pay maintenance even if she is pregnant, and he cannot return to her." Malik said, "A free man is not obliged to pay for the suckling of his son when he is a slave of other people, nor is a slave obliged to spend his money for what his master owns except with the permission of his master."

حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، عَنْ يَحْيَى بْنِ سَعِيدٍ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، أَنَّ عُمَرَ بْنَ الْخَطَّابِ، قَالَ أَيُّمَا امْرَأَةٍ فَقَدَتْ زَوْجَهَا فَلَمْ تَدْرِ أَيْنَ هُوَ فَإِنَّهَا تَنْتَظِرُ أَرْبَعَ سِنِينَ ثُمَّ تَعْتَدُّ أَرْبَعَةَ أَشْهُرٍ وَعَشْرًا ثُمَّ تَحِلُّ ‏.‏ قَالَ مَالِكٌ وَإِنْ تَزَوَّجَتْ بَعْدَ انْقِضَاءِ عِدَّتِهَا فَدَخَلَ بِهَا زَوْجُهَا أَوْ لَمْ يَدْخُلْ بِهَا فَلاَ سَبِيلَ لِزَوْجِهَا الأَوَّلِ إِلَيْهَا ‏.‏ قَالَ مَالِكٌ وَذَلِكَ الأَمْرُ عِنْدَنَا وَإِنْ أَدْرَكَهَا زَوْجُهَا قَبْلَ أَنْ تَتَزَوَّجَ فَهُوَ أَحَقُّ بِهَا ‏.‏ قَالَ مَالِكٌ وَأَدْرَكْتُ النَّاسَ يُنْكِرُونَ الَّذِي قَالَ بَعْضُ النَّاسِ عَلَى عُمَرَ بْنِ الْخَطَّابِ أَنَّهُ قَالَ يُخَيَّرُ زَوْجُهَا الأَوَّلُ إِذَا جَاءَ فِي صَدَاقِهَا أَوْ فِي امْرَأَتِهِ ‏.‏

sunnah.com

also referenced under: Book 29, Hadith 1212 (In-Book)