Exodus 21:12-15

12“Whoever strikes a person so that he dies must be put to death.

13But if he did not intend any harm, and yet God allowed it to happen, I will appoint a place for you where he may flee.

14If a person schemes and willfully acts against his neighbor to murder him, you must take him from my altar to be put to death.

15“Whoever strikes his father or his mother must be put to death.