One witness can not rise up against a person for an iniquity or sin they have committed. A matter must be established by testimony of two or three witnesses.
At the mouth of two witnesses, or three witnesses, a person who is to be executed must be executed. At the mouth of one witness a person must not be executed.
Then y’all must also seat two worthless men before him, and have them testify against him, saying, ‘You cursed God and the king!’ Then y’all are to carry him out and stone him to death.”
“‘Whoever kills any person, the murderer must be put to death based on the testimony of witnesses. But no one is to be put to death on the testimony of one witness.