'Graves' in the Bible

"Woe to you, experts in the law and you Pharisees, hypocrites! You build tombs for the prophets and decorate the graves of the righteous.

Woe to you! You are like unmarked graves, and people walk over them without realizing it!"

"Their throats are open graves, they deceive with their tongues, the poison of asps is under their lips."