Also, you must never accept a ransom payment for the life of someone judged guilty of murder and subject to execution; murderers must always be put to death.
“Well, money can’t settle this matter between us and the family of Saul,” the Gibeonites replied. “Neither can we demand the life of anyone in Israel.” “What can I do then?” David asked. “Just tell me and I will do it for you.”
“All murderers must be put to death, but only if evidence is presented by more than one witness. No one may be put to death on the testimony of only one witness.
And never accept a ransom payment from someone who has fled to a city of refuge, allowing a slayer to return to his property before the death of the high priest.