Numbers 35:31

You shall not accept money from him who is guilty of blood, and he shall be put to death promptly

Other versions

King James Version

Moreover ye shall take no satisfaction for the life of a murderer, which is guilty of death: but he shall be surely put to death.

English Standard Version

Moreover, you shall accept no ransom for the life of a murderer, who is guilty of death, but he shall be put to death.

New International Version

"'Do not accept a ransom for the life of a murderer, who deserves to die. He must surely be put to death.