Musannaf Ibn Abi Shayba 18:783

Abu Bakr narrated to us, he said: Abd al-Rahim narrated to us, from Qatadah, from al-Hasan, from Samurah ibn Jundub, who said: I heard the Messenger of Allah (may Allah bless him and grant him peace) saying: "Whoever kills his slave, we kill him; and whoever mutilates his slave, we mutilate him."