Matthew 23

The Savior said to the scribes and Pharisees -

"...woe unto you...hypocrites!" (New Testament Matthew 23:13)

Why were they hypocrites?

"...for ye shut up the kingdom of heaven against men: for ye neither go in yourselves, neither suffer ye them that are entering to go in." (New Testament Matthew 23:13)

"...for ye devour widows' houses, and for a pretence make long prayer: therefore ye shall receive the greater damnation." (New Testament Matthew 23:14)

"...for ye compass sea and land to make one proselyte, and when he is made, ye make him twofold more the child of hell than yourselves." (New Testament Matthew 23:15)

"...for ye pay tithe of mint and anise and cummin, and have omitted the weightier matters of the law, judgment, mercy, and faith: these ought ye to have done, and not to leave the other undone." (New Testament Matthew 23:23)

"...for ye make clean the outside of the cup and of the platter, but within they are full of extortion and excess." (New Testament Matthew 23:25)

"...for ye love the uppermost seats in the synagogues, and greetings in the markets." (New Testament Luke 11:43)

"...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." (New Testament Matthew 23:27)

"...for ye are as graves which appear not, and the men that walk over them are not aware of them." (New Testament Luke 11:44)

"...because ye build the tombs of the prophets, and garnish the sepulchres of the righteous,
30 And say, If we had been in the days of our fathers, we would not have been partakers with them in the blood of the prophets.
31 Wherefore ye be witnesses unto yourselves, that ye are the children of them which killed the prophets." (New Testament Matthew 23:29 - 31)

To these the Lord said -

"Ye serpents, ye generation of vipers, how can ye escape the damnation of hell?" (New Testament Matthew 23:33)

And in modern day he has again said -

"...wo unto them that are deceivers and hypocrites, for, thus saith the Lord, I will bring them to judgment.
7 Behold, verily I say unto you, there are hypocrites among you, who have deceived some, which has given the adversary power; but behold such shall be reclaimed;
8 But the hypocrites shall be detected and shall be cut off, either in life or in death, even as I will; and wo unto them who are cut off from my church, for the same are overcome of the world." (Doctrine and Covenants Section 50:6 - 8)

Warning all the saints -

"Wherefore, let every man beware lest he do that which is not in truth and righteousness before me." (Doctrine and Covenants Section 50:9)

What is a hypocrite -

Elder Mark E. Petersen said -

“As God condemns immorality, so he denounces hypocrisy, which is one of the worst forms of dishonesty. When he describes the hell of the world to come, he specifies that dishonest persons will go there. As no unclean thing can enter the presence of the Lord, so no liar nor cheat nor hypocrite can abide in his kingdom.
“Dishonesty is directly related to selfishness, which is its origin and source. Selfishness is at the root of nearly all the disorders that afflict us, and man’s inhumanity to man continues to make countless thousands mourn.” (Mark E. Petersen in CR, Oct. 1971, pp. 63–64.)

I have come to know a few liars where there lies have spun out of control. Sterling W. Sill clearly explained this -

“I know a young man who is ruining his own success as well as the lives of others because he greatly exaggerates his own virtues and self-importance. He tolerates a serious selfishness and continually excuses his sins and weakness. He takes credit for imagined abilities that are based on false assumptions.
He always blames others when things go wrong. And for something to seem right to him, it needs only to appear to be in his own interest. But his problems of false witness to himself are fast getting out of hand. Reason is becoming more and more difficult for him as he is rapidly losing the power to undeceive himself.” (Sterling W. Sill, Church News, 8 Jan. 1966, p. 9.)

Woe means "to express grief, regret, or distress"

Woe to the hypocrites unless they repent.