“A single witness shall not suffice to convict a person of any crime or wrong-doing in connection with any offense that may be committed. Only on the evidence of two or three witnesses, shall a charge be sustained.”
The witness of 1 person is not good enough to convict anyone of any crime. There must be at least 2 or 3 witnesses to sustain a charge.
“If a malicious witness comes forward to accuse someone of wrongdoing, then both parties to the dispute shall appear before Yahweh, before the priests and the judges who are in office in those days. The judges shall make a through inquiry. If the witness is a false witness, having testified falsely against another, then you shall do to the false witness just as a false witness had meant to do to the other. So you shall purge the evil from your midst. The rest shall hear and be afraid. A crime such as this shall never again be committed among you.”
Both parties of a dispute must appear before the priests and judges. If someone had been a false witness, they must be purged and suffer the consequences. It is not clear if they are killed or not.