Matthew Chapter 23 - verses
25) "Woe to you, teachers of the law and Pharisees, you hypocrites! You clean the outside of the cup and dish, but inside they are full of greed and self-indulgence. 26) Blind Pharisee! First clean the inside of the cup and dish, and then the outside also will be clean.Many are satisfied with a superficial cleansing, and the appearance of righteousness before others; God demands a true cleansing; we must be clean before God and man.
Jesus rebukes the religious leaders because it is not enough to have a life that appears good, there must be spiritual life also
27) "Woe to you, teachers of the law and Pharisees, you hypocrites! You are like whitewashed tombs, which looks beautiful on the outside but on the inside are full of dead men's bones and everything unclean. 28) In the same way, on the outside you appear to people as righteous but on the inside you are full of hypocrisy and wickedness.
Before Passover, it was the custom of the Jews to whitewash the tombs in the city of Jerusalem so that no one would touch one accidentally, thus making themselves unclean; Jesus says these religious leaders are like these whitewashed tombs.
During the feasts in Jerusalem, they would whitewash the sepulchers so that they were marked, so that a stranger would not inadvertently stumble upon a grave which would ceremonially make you unclean, and thus, not be able to celebrate Passover.
God is never fooled by our inward state; He sees what we actually are, not what we appear to be to other men.
Woe to those who honor dead prophets, but murder the living prophets
29) "Woe to you, teachers of the law and Pharisees, you hypocrites! You build tombs for the prophets and decorate the graves of the righteous. 30) And you say, 'If we had lived in the days of our forefathers, we would not have taken part with them in shedding the blood of the prophets.' 31) So you testify against yourselves that you are the descendants of those who murdered the prophets. 32) Fill up, then, the measure of the sin of your forefathers!
33) "You snakes! You brood of vipers! How will you escape being condemned to hell? 34) Therefore I am sending you prophets and wise men and teachers. Some of them you will kill and crucify; others you will flog in your synagogues and pursue from town to town. 35) And so upon you will come all the righteous blood that has been shed on earth, from the blood of righteous Abel to the blood of Zechariah son of Berekiah, whom you murdered between the temple and the altar. 36) I tell you the truth; all this will come upon this generation