'White washed' in the Bible

Woe unto you, scribes and Pharisees, hypocrites! for you are like unto whitewashed sepulchers, which indeed appear beautiful outwardly but are within full of dead men's bones, and of all uncleanness.

Then said Paul unto him, God shall smite you, you whitewashed wall: for do you sit to judge me after the law, and command me to be smitten contrary to the law?