12 “One who strikes a man so that he dies shall surely be put to death, Exodus 21:12WEB
This passage contains a positive command, directed toward Israel: "Anyone who strikes a man so that he dies shall surely be put to death".
This command is part of the Civil/Judicial Law.
This command fits with laws related to Retributive Justice.
For lack of a passage describing the direct abrogation of this penalty in the New Covenant, this command is understood to impose a persistent obligation on modern government.
The command finds its ultimate fulfillment in the finished work of Jesus, such that when all history has finally run its course, everyone who has believed in Jesus will have eternal life (John 3:15). At that time, death itself will have been cast into eternal destruction and thus rendered unable to affect us (Rev 20:14).