Whited sepulchre

A whited sepulchre is a metaphor for a hypocrite or for someone who appears virtuous but is in fact morally corrupt. The source is The New Testament, Matthew 23: 27. “Woe unto you, scribes and Pharisees, hypocrites! For ye are like unto whited sepulchres, which indeed appear beautiful outward, but within are full of dead men’s bones and all uncleanness.”