'White washed' in the Bible

"Alas for you, Scribes and Pharisees, hypocrites, for you are just like whitewashed sepulchres, the outside of which pleases the eye, though inside they are full of dead men's bones and of all that is unclean.

"Before long," exclaimed Paul, "God will strike you, you white-washed wall! Are you sitting there to judge me in accordance with the Law, and do you yourself actually break the Law by ordering me to be struck?"