Job 20:13 KJV

Though he spare it, and forsake it not; but keep it still within his mouth:
Job 20:13, King James Version

In context

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:

14 Yet his meat in his bowels is turned, it is the gall of asps within him.