Job 20:12 KJV

Though wickedness be sweet in his mouth, though he hide it under his tongue;
Job 20:12, King James Version

In context

11 His bones are full of the sin of his youth, which shall lie down with him in the dust.

12 Though wickedness be sweet in his mouth, though he hide it under his tongue;

13 Though he spare it, and forsake it not; but keep it still within his mouth: