Musar para sa Mga Awit 10:3

And there are some from this evil group for which it is not enough that they do not wear trembling when they bypass the law and the testimonies, but they praise and bless themselves when they fulfill their desires. So they bring anger and scorn before God, as it is stated (Psalms 10:3), “The wicked crows about his unbridled lusts; the grasping man reviles and scorns the Lord.” And Isaiah, peace be upon him, spoke about the destruction of this group - as it is stated (Isaiah 1:28), “But rebels and sinners shall all be crushed, and those who forsake the Lord shall perish.” And he compared the rebels and the sinners to a broken vessel that has a remnant; but he said that “those that forsake God shall perish.” For they have no share in the world to come, as the matter is stated (Malachi 3:19), “and leave of them neither stock nor boughs.”

And this is the thing about the group of flatterers - the content of this group is divided into nine sections:
The first section: The flatterer who recognizes or sees or knows that there is injustice in the hand of his fellow, and that he is holding fast to deception; or that he sinned to another person with evil speech or verbal abuse - and he blandishes him [with] improper speech, saying, “You did not do evil.” The sin of one who refrains from reprimand - as it is stated (Leviticus 19:17), “you shall surely reprimand your countryman and not bear sin because of him” - is too small for him; so he increased the sin by saying, “You did not sin.” It is like the matter that is stated (Jeremiah 23:14), “they encourage evildoers.” And behold this is a criminal offense in the hand of the foolish flatterer, for he was not zealous against falsehood, but rather assisted the falsehood, and said about the bad, “Good,” and made darkness, light. He also placed a stumbling block in front of the sinner in two aspects. The first one is that he will not regret his evil. And the second is that he will repeat his evil on the next day. For the one who flatters the other one about his desire praises [that] evildoer. Besides that he will carry the punishment for the damage that he caused to the one towards whom the sinner was guilty, by justifying [the sinner]; he will [also] be punished for the false words, as it is stated (Psalms 5:7), “You doom those who speak lies.” And it is stated (Proverbs 17:15), “To acquit the guilty and convict the innocent; both are an abomination to the Lord.” All the more so if the injustice in the hand of his fellow, the evildoer, is revealed to the public. For when he, the flatterer, said to him in front of people, “You are pure, without transgression” - he has profaned and disgraced the religion and the law.

Not only that but even if one does a Mitzva (good deed) during the time of his work, it will not be considered a merit but rather a sin in his hand. For a sin cannot be considered a Mitzva. And scripture states: "[I am G-d who loves justice and] hates theft in an offering" (Isaiah 61:8). In relation to this, our Sages of blessed memory said: "one who steals a measure of wheat, mills it, bakes and recites a blessing over it, is not blessing but rather blaspheming as written 'and the robber who blesses blasphemes G-d' (Tehilim 10:3)".