Woe to you! For you are like graves that are not noticeable, so that men walk over them without realizing it.
Other versions
King James Version
Woe unto you, scribes and Pharisees, hypocrites! for ye are as graves which appear not, and the men that walk over them are not aware of them.English Standard Version
Woe to you! For you are like unmarked graves, and people walk over them without knowing it."New International Version
"Woe to you, because you are like unmarked graves, which men walk over without knowing it."