NET
30 “Whoever kills any person, the murderer must be put to death by the testimony of witnesses, but one witness cannot testify against any person to cause him to be put to death.
Darby
30 Whoever shall smite a person mortally, at the mouth of witnesses shall the murderer be put to death; but one witness shall not testify against a person to cause him to die.
KJV
30 Whoso killeth any person, the murderer shall be put to death by the mouth of witnesses: but one witness shall not testify against any person [to cause him] to die.