حديث 1605 من موطأ مالك

Malik said about a man who had his slave in a kitaba and then the
mukatab died and left his umm walad, and there remained for him some
of his kitaba to pay and he left what would pay it, "The umm walad is
a slave since the mukatab was not freed until he died and he did not
leave children that were set free by his paying what remained, so that
the umm walad of their father was freed by their being set free."


Malik said about a mukatab who set free a slave of his or gave
sadaqa with some of his property and his master did not know that
until he had set the mukatab free, "That has been performed by him and
the master does not rescind it. If the master of the mukatab knows
before he sets the mukatab free, he can reject that and not permit it.
If the mukatab is then freed and it becomes in his power to do so, he
does not have to free the slave, nor give the sadaqa unless he does it
voluntarily from himself."