LEV1003 "You shall not wrong one another" This verse forbids us to say anything that will insult or anger another person (Bava Metzia 58b). Some examples of this would be: (1) reminding someone about his previous misdeeds; (2) embarrassing someone for his family background; (3) ridiculing someone for his lack of Torah knowledge; (4) insulting someone for his lowly status; (5) asking someone how he would answer a certain question when you know that he is not competent to reply. If you relate loshon hora to others in the presence of the victim, besides being guilty of speaking loshon hora, you also violate this prohibition.

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LEV1045 "If your brother be waxen poor and his means fail him when he is with you, then you shall uphold him" The Torah obligates us to give financial aid to a fellow Jew in order to prevent his becoming poor. This could be in the form of a grant, a loan, or a source of income (Rambam Matnos Aniyim 10:7). If you relate loshon hora and as a consequence the subject loses his job or income, you have violated this commandment.

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NUM224 "You shall not act similar to Korach and his company". This verse forbids us to maintain disputes (Sanhedrin 110a). If you will cause the continuation of a quarrel by relating loshon hora, you violate this prohibition.

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NUM428 "You shall not pollute the land wherein you are". This verse forbids us to flatter a wrongdoer (The Gaonim RAM Baal Hatofos and RSH Ben Gabriol). If you know that Reuven dislikes someone, the correct thing to do is to admonish Reuven for his hatred. By speaking loshon hora to Reuven about his enemy in order to find favor in his eyes, you violate this prohibition. A listener to loshon hora can also be guilty of this prohibition. It is very common for people to nod their heads or vocally show approval when someone tells them loshon hora. This flattery is terms chanifas and is a very serious offence (see Shaarey Tshuvah 3:187-199).

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DEUT253 "You shall teach them diligently to your children, and you shall talk of them when you sit in your house, and when you walk by the way, and when you lay down, and when you rise up." Every single word of the Torah that you study is a fulfillment of a mitzvah (see Shnos Eliyohu-Paiah). Conversely, for every single word of loshon hora that you speak, you are guilty of bitul Torah, not having spent your time fruitfully in studying Torah.

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DEUT376 "Beware lest you forget the Lord, your God". This is the prohibition against being conceited (Sotah 5a). One who ridicules others is generally motivated by a feeling of superiority. If he were aware of his own faults, he surely would not deprecate others. The Talmud (ibid.) equates arrogance with idolatry and states that whoever has this trait will not be privileged to be resurrected by tchiyas hamaisim. The gravity of the transgression is increased if the speaker elevates his own esteem through the medium of degrading someone else. Our Sages (Yerushalmi Chagigah 2:1) I have declared that such a person will lose his share in olam haboh.

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DEUT473 "To Him shall you cleave". This commandment requires us to keep in the company of Talmidai Chachomim so that we should learn from their example (Rambam Daios 6:1-2). If you forsake their company to join a group of people who are speaking loshon hora, you violate this commandment.

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DEUT479 "The Lord your God shall you fear". We are obligated to realize that Hashem Yisborach is aware of every move we make, and that there is retribution for every wrongdoing. Someone who is careless with his speech violates this commandment.

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DEUT956 "One witness shall not rise up against a man for any inquiry or for any sin" If a solitary witness testifies against someone before a Bais Din in a non-financial matter, he violates this prohibition besides being guilty of speaking loshon hora. In financial matters the testimony of a single witness has practical effects. (It can obligate someone to make an oath.) In non-financial matters, however, the Bais Din cannot accept the testimony of only one witness. Therefore his coming to testify merely blackens the reputation of the person he speaks against without any beneficial results.

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DEUT1342 "Take heed concerning the plague of leprosy" Sifra explains that this verse refers to loshon hora which is punishable by the infliction of leprosy.

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