Numbers 35:16

And if he should smite him with an iron instrument, and the man should die, he is a murderer; let the murderer by all means be put to death.

And if he should strike him with an iron instrument, and the man should die, he is a murderer; let the murderer by all means be put to death.

“‘But if he struck him with an instrument of iron, so that he died, he is a murderer. The murderer shall surely be put to death.