International Standard Version Based on the testimony of two or three witnesses, they must surely die. But they are not to die based on the testimony of one person.
American Standard Version At the mouth of two witnesses, or three witnesses, shall he that is to die be put to death; at the mouth of one witness he shall not be put to death.
Young's Literal Translation By the mouth of two witnesses or of three witnesses is he who is dead put to death; he is not put to death by the mouth of one witness;