15 One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sins: at the mouth of two witnesses, or at the mouth of three witnesses, shall a matter be established.
*Minor differences ignored. Grouped by changes, with first version listed as example.
One witness shall not rise up, etc. - See Numbers 35:30 (note).
One witness shall not rise up against a man for any iniquity, or for any sin, in any sin that he sinneth,.... Whether capital sins, or pecuniary debts; or whatsoever sins a man may be guilty of whether sins against the first or second table of the law, whether greater or lesser sins, whether in moral or civil things; the Jews except only in the case of a woman suspected of adultery and of beheading the heifer:
at the mouth of two witnesses, or at the mouth of three witnesses, shall the matter be established; either for acquittance or condemnation; and the witnesses may not, as Jarchi says, write their testimony in a letter, and send it to the sanhedrim, nor may an interpreter stand between the witnesses and the judges; See Gill on Deuteronomy 17:6.
Sentence should never be passed upon the testimony of one witness alone. A false witness should suffer the same punishment which he sought to have inflicted upon the person he accused. Nor could any law be more just. Let all Christians not only be cautious in bearing witness in public, but be careful not to join in private slanders; and let all whose consciences accuse them of crime, without delay flee for refuge to the hope set before them in Jesus Christ.
TWO WITNESSES REQUIRED. (Deuteronomy 19:15)
One witness shall not rise up against a man for any iniquity--The following rules to regulate the admission of testimony in public courts are founded on the principles of natural justice. A single witness shall not be admitted to the condemnation of an accused person.
The Punishment of a False Witness. - To secure life and property against false accusations, Moses lays down the law in Deuteronomy 19:15, that one witness only was not "to rise up against any one with reference to any crime or sin, with every sin that one commits" (i.e., to appear before a court of justice, or be accepted as sufficient), but everything was to be established upon the testimony of two or three witnesses. The rule laid down in Deuteronomy 17:6 and Numbers 35:30 for capital crimes, is raised hereby into a law of general application (see at Numbers 35:30). קוּם (in Deuteronomy 19:15), to stand, i.e., to acquire legal force. - But as it was not always possible to bring forward two or three witnesses, and the statement of one witness could not well be disregarded, in Deuteronomy 19:16-18 Moses refers accusations of this kind to the higher tribunal at the sanctuary for investigation and decision, and appoints the same punishment for a false witness, which would have fallen upon the person accused, if he had been convicted of the crime with which he was charged. סרה בּו לענות, "to testify against his departure," sc., from the law of God, not merely falling away into idolatry (Deuteronomy 13:6), but any kind of crime, as we may gather from Deuteronomy 19:19, which would be visited with capital punishment.
Rise - Or be established, accepted, owned as sufficient: it is the same word which in the end of the verse is rendered, be established.
*More commentary available at chapter level.