3:8-13 The preaching of the gospel is predicted, when vengeance would be executed on the Jewish nation. The purifying doctrines of the gospel, or the pure language of the grace of the Lord, would teach men to use the language of humility, repentance, and faith. Purity and piety in common conversation is good. The pure and happy state of the church in the latter days seems intended. The Lord will shut out boasting, and leave men nothing to glory in, save the Lord Jesus, as made of God to them wisdom, righteousness, sanctification, and redemption. Humiliation for sin, and obligations to the Redeemer, will make true believers upright and sincere, whatever may be the case among mere professors.
13. nor speak lies—worshipping God in truth, and towards man having love without dissimulation. The characteristic of the 144,000 sealed of Israel.
none shall make them afraid—either foreign foe, or unjust prince (Zep 3:3), prophet, or priest (Zep 3:4).