Muwatta Imam Malik (Riwayat Yahya)

Imam Malik, may Allah have mercy on him, said: In our view, the ruling is that when a slave is killed intentionally or unintentionally, and then his master brings one witness each, he should take an oath along with his witness, and after that, he should take the value of his slave. There is no qasamah in the case of a slave, neither in intentional killing nor in unintentional killing, and I have not heard this from any of the people of knowledge.

Imam Malik, may Allah have mercy on him, said that if a slave is killed intentionally or by mistake, then neither qasamah nor oath is upon his master, and the master will be entitled to the price only when he brings just witnesses, two or one and takes an oath for the other; I have heard this as good.