Jude 1:3-4 - Jude's Purpose In Writing
3 Beloved, my whole concern was to write to you on the subject of our common salvation, but I am forced to write you an appeal to defend the faith which has once for all been committed to the saints; 4 for certain persons have slipped in by stealth (their doom has been predicted long ago), impious creatures who pervert the grace of our God into immorality and disown our sole liege and Lord, Jesus Christ.