Luke.11.44  Woe to you! for you are like graves which are not seen, and men walk over them without knowing it."
Rom.3.13  "Their throat is an open grave, they use their tongues to deceive." "The venom of asps is under their lips."

Hyper-concordance v1.1, by Sean Boisen. Scripture verses taken from the Revised Standard Version, copyright 1952, 1971.