EXOD604 Do not eat (or derive any benefit) from a killer ox that has been sentenced to death by an authorized court of law (beis din). Key concept: To impress upon us that whenever tragedy strikes, the cause for it must be shunned and disdained, even if the incident was accidental. An animal lacks intellect and self-control, but if it kills a human being it becomes disgusting in the eyes of Hashem, so we must distance ourselves from it. Reflection upon this mitzvah will cause us to be careful about our own actions. We will make sure that nothing that we do will ever cause harm or injury to anyone.