The Old Testament says very little about hell or the fate of the wicked. However, when the question is squarely addressed, the scriptures teach the utter destruction of the wicked.
Consider Psalm 37 —
(Psa 37) Of David. Do not fret because of evil men or be envious of those who do wrong; 2 for like the grass they will soon wither, like green plants they will soon die away. …
9 For evil men will be cut off, but those who hope in the LORD will inherit the land. 10 A little while, and the wicked will be no more; though you look for them, they will not be found. … Continue reading