Musar su Geremia 9:7

The second section: One who lies, but there is no damage or loss to his fellow from the actual lie; however he plans it in order to do the damage or the evil - like one who deceives his fellow to believe that he is his friend and trusted companion; and he plans that [the other] will trust him through this and not be on guard against him, so that he will be able to lead him to evil; like the matter that is stated (Jeremiah 9:7), “One speaks peace to his fellow, but lays an ambush for him in his heart.” And it is stated after it (Jeremiah 9:8), “‘Shall I not punish them for such deeds,’ says the Lord; ‘shall I not bring retribution on such a nation as this?’” And the punishment of these two sections is for two things: For the lie and for the damage that [comes with it]. For falsehood [even] without the angle of damage is an abomination to God, as it is stated (Proverbs 6:16-18), “Six things the Lord hates, etc: A haughty bearing; a lying tongue; etc. A mind that hatches plots of iniquity.” [And it is stated] (Proverbs 8:13), “I have hated duplicity in speech.” And it is stated (Job 15:16), “What then of one loathsome and foul, man, who drinks wrongdoing like water!” And to flesh and blood also is falsehood loathsome, as it is stated (Proverbs 12:22), “Lying lips are an abomination to the Lord.” (It appears to me that there is a printing error here, and it is supposed to say: And it is stated [Proverbs 8:13], “I have hated duplicity in speech”; and it is stated [Proverbs 12:22], “Lying lips are an abomination to the Lord.” And to flesh and blood also is falsehood loathsome, as it is stated [Job 15:16], “What then of one loathsome and foul, etc.” And it means to say that the understanding of the language of the verse is that a man who drinks wrongdoing like water, is essentially loathsome and foul - for he is even loathsome and foul to flesh and blood.)

The second category is where there is no present damage to his fellow in the lie itself, but where the liar intends to deceive his fellow into believing in him and trusting him, so that he will not be on guard against him — and then he will be able to do evil to him, as it is said, "One speaketh peaceably to his neighbour with his mouth, but in his heart he layeth wait for him" (Jer. 9:7). Even in the eyes of people, falsehood is repulsive, as it is said, "It is an abomination to kings to commit wickedness … Righteous lips are the delight of kings" (Prov. 16:12—13).