Job 20:12

¹⁰ His sons will seek the favor of the poor, for his own hands must return his wealth.

¹¹ The youthful vigor that fills his bones will lie down with him in the dust.

Though evil is sweet in his mouth and he conceals it under his tongue,

¹³ though he cannot bear to let it go and keeps it in his mouth,

¹⁴ yet in his stomach his food sours into the venom of cobras within him.

Do read the surrounding verses too, because the context often says more than a single verse.

Compare

BSB: Though evil is sweet in his mouth and he conceals it under his tongue,
KJV: Though wickedness be sweet in his mouth, though he hide it under his tongue;
WEB: “Though wickedness is sweet in his mouth, though he hide it under his tongue,
ASV: Though wickedness be sweet in his mouth, Though he hide it under his tongue,
DARBY: Though wickedness be sweet in his mouth [and] he hide it under his tongue,
BLB: Though evil is sweet in his mouth, [and] he hides it under his tongue,

ÅB: Smaker enn det onde søtt i hans munn, skjuler han det under sin tunge,
OTB: «Selv om urett er søt i hans munn
og han gjemmer den under sin tunge,
B1930: Smaker enn det onde søtt i hans munn, skjuler han det under sin tunge,

Psalms 10:7
His mouth is full of cursing, deceit, and violence; trouble and malice are under his tongue.
Read in context
Job 15:16
how much less man, who is vile and corrupt, who drinks injustice like water?
Read in context
Ecclesiastes 11:9
Rejoice, O young man, while you are young, and let your heart be glad in the days of your youth. Walk in the ways of your heart and in the sight of your eyes, but know that for all these things God will bring you to judgment.
Read in context
Proverbs 9:17–18
“Stolen water is sweet, and bread eaten in secret is tasty!”
Read in context
Psalms 109:17–18
The cursing that he loved, may it fall on him; the blessing in which he refused to delight, may it be far from him.
Read in context
Proverbs 20:17
Food gained by fraud is sweet to a man, but later his mouth is full of gravel.
Read in context
Genesis 3:6
When the woman saw that the tree was good for food and pleasing to the eyes, and that it was desirable for obtaining wisdom, she took the fruit and ate it. She also gave some to her husband who was with her, and he ate it.
Read in context