'White washed' in the Bible

“Woe to you, [self-righteous] scribes and Pharisees, hypocrites! For you are like whitewashed tombs which look beautiful on the outside, but inside are full of dead men’s bones and everything unclean.

Then Paul said to him, “God is going to strike you, you whitewashed wall! Do you actually sit to judge me according to the Law, and yet in violation of the Law order me to be struck?”