Numbers 35:30-31

New International Version

³⁰ “‘Anyone who kills a person is to be put to death as a murderer only on the testimony of witnesses. But no one is to be put to death on the testimony of only one witness.^(A)

³¹ “‘Do not accept a ransom^(B) for the life of a murderer, who deserves to die. They are to be put to death.