For I told him that I would judge his family forever because of the sin he knew about; his sons blasphemed God, and he failed to restrain them.
NIV
And I [now] announce to him that I will judge and punish his house forever for the iniquity of which he knew, for his sons were bringing a curse upon themselves [blaspheming God], and he did not restrain them.
AMP
For I have told him that I will judge his house for ever for the iniquity which he knoweth; because his sons made themselves vile, and he restrained them not.
KJV