Proverbs 9:18
"But he knoweth not that the dead are there; and that her guests are in the depths of hell."
Cross References (ranked by relevance)
Proverbs 7:27
Her house is the way to hell, going down to the chambers of death.
Proverbs 5:5
Her feet go down to death; her steps take hold on hell.
Psalm 82:5
They know not, neither will they understand; they walk on in darkness: all the foundations of the earth are out of course.
Proverbs 6:26
For by means of a whorish woman a man is brought to a piece of bread: and the adulteress will hunt for the precious life.
Proverbs 1:7
The fear of the LORD is the beginning of knowledge: but fools despise wisdom and instruction.