The Torah forbids us to harm or cause suffering to others. Even from a selfish perspective, we should be careful not to harm others, since we will ultimately suffer because of it.
* Refrain from insulting others.
* Refrain from talking negatively about others, unless it is necessary for a practical and constructive purpose.
* Refrain from lying to others.
* Refrain from deceiving others in financial matters.
* Refrain from causing others pain or unpleasantness through actions or words.
* Refrain from causing others financial losses. The money of others should be as dear as our own.
(Talmud - Avot 2:12; Mesilat Yesharim, ch.19; Rabbi Pliskin's Gateway to Happiness, p.139)
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