Woe unto you, scribes and Pharisees, hypocrites! for ye are like unto whited sepulchres, which indeed appear beautiful outward, but are within full of dead men's bones, and of all uncleanness. For ye are like - Παρομοιαζετε, ye exactly resemble - the parallel is complete.
Whited sepulchres - White-washed tombs. As the law considered those unclean who had touched any thing belonging to the dead, the Jews took care to have their tombs white-washed each year, that, being easily discovered, they might be consequently avoided.