Leviticus 24:21

And he that killeth a beast, he shall restore it: and he that killeth a man, he shall be put to death.

Cross-reference

Leviticus 24:17 states the death penalty for murder, which is the second part of this verse—one law for killing a person.

Leviticus 24:18 states the same principle: restitution for killing an animal, contrasting with death for killing a human.

Exodus 21:33 details restitution for an animal killed in a pit—this law similarly requires making good for a killed animal.

Exodus 20:13 prohibits murder, and this verse enforces that command with capital punishment for taking a human life.

Deuteronomy 19:13 reinforces the same capital punishment for murder, commanding no pity to purge innocent blood from Israel.