Job 20:13 in the World English Bible
though he spare it, and will not let it go, but keep it still within his mouth,
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.