Parallel
Deuteronomy 19:15
Brenton's English Septuagint · Berean Standard Bible
One witness shall not stand to testify against a man for any iniquity, or for any fault, or for any sin which he may commit; by the mouth of two witnesses, or by the mouth of three witnesses, shall every word be established.
A lone witness is not sufficient to establish any wrongdoing or sin against a man, regardless of what offense he may have committed. A matter must be established by the testimony of two or three witnesses (note: Cited in Matthew 18:16 and 2 Corinthians 13:1).