Imam Malik's Muwatta, Chapter: Divorce

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."