Exodus 21:29

But if the ox were wont to push with his horn in time past, and it hath been testified to his owner, and he hath not kept him in, but that he hath killed a man or a woman; the ox shall be stoned, and his owner also shall be put to death.

Cross-reference

Exodus 21:32 applies the same known-goring ox to slave victims, with a lower penalty—thirty shekels ransom instead of death.

Exodus 21:36 parallels this case but for property damage (ox kills ox) instead of human death, with restitution rather than death.

Exodus 21:34 is another liability law—for an open pit killing an animal—sharing the principle of owner responsibility for harm.

Exodus 20:13's 'You shall not murder' underlies this case law—the owner's negligence causing death makes him liable to capital punishment.

Genesis 9:5 declares God will require the life of man from every beast; this law implements that by stoning the ox and executing the negligent owner.