Albert Barnes Commentary Proverbs 1:12

"Let us swallow them up alive as Sheol, And whole, as those that go down into the pit;" — Proverbs 1:12 (ASV)

That is, "We will be as all-devouring as Sheol. The destruction of those we attack shall be as sudden as that of those who go down quickly into the pit." Some render the latter clause to mean that upright men are as those that go down to the pit. "Pit" here is a synonym for Sheol, the great cavernous depth, the shadow-world of the dead.