Sayyiduna Ya'la bin Murrah (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "Do not mutilate the servants of Allah (that is, do not disfigure them by cutting off their limbs)."
Hadith Referenceالمعجم الكبير للطبراني / باب الياء / 18901