For certain men have secretly infiltrated [your ranks]; they are men who had been written about long ago that they should be judged [and condemned] for perverting the unearned favor of our God into [a license for] living unrestrained, indecent lives, and who deny [the identity and work of] our only Master and Lord, Jesus Christ.

It is too bad for these people, for they have followed the example of Cain [the murderer]; for the sake of money they have rushed into the [same] error as Balaam committed [See Num. 25:1-5; 31:16]; they [will] perish [spiritually] for having rebelled [against God] like Korah did. [See Num. 16:1-3, 31-35].