The sinners speak of murdering innocent people as if they were Sheol and they would take a living and healthy person down to the place where dead people go. (See: [[rc://en/ta/man/translate/figs-metaphor]])
This speaks of the grave as if it were a person that swallows humans and takes them down to the place of the dead. (See: [[rc://en/ta/man/translate/figs-personification]])
The wicked expect to destroy their victims in the same way Sheol, the place of the dead, takes away even healthy people.
# make them like those who fall into the pit
Possible meanings are 1) this refers to travelers who fall into a deep hole where no one will ever find them or 2) here "pit" is another word that means Sheol or the place where dead people go.