For certain men have come among you secretly, marked out before in the holy Writings for this evil fate, men without the fear of God, turning his grace into an unclean thing, and false to our only Master and Lord, Jesus Christ.

A curse on them! They have gone in the way of Cain, running uncontrolled into the error of Balaam for reward, and have come to destruction by saying evil against the Lord, like Korah.