It is not only forbidden to steal items. One may not help or encourage others to steal. Included in this prohibition is purchasing stolen merchandise, or merchandise that has very likely been stolen. The source of this prohibition is the mitzvo of :”Do not put a stumbling block in front of a blind man.” This mitzvo teaches us that one may not cause or aid other people to sin. This also applies to helping a non-Jew transgress one of the mitzvos that pertain to him. Since it is forbidden for a non-Jew to steal, one may not purchase an item that was stolen by one non-Jew from another, because doing so, encourages the thief to continue in his evil ways.
Similarly, one may not sell equipment or provide information to a person who appears to be preparing to use it in order to steal. There are two reasons given as to why one may not cause others to sin.
1. To do so, constitutes a direct violation against Hashem. Hashem created the world in such a way that the spiritual actions of human beings have a great effect on creation. When a person performs a mitzvo, he causes great benefit to the world in a spiritual sense. Conversely, when he sins, he causes great spiritual damage. Accordingly, when a person causes or helps his fellow sin, he is contributing to the subsequent damage.
2. Causing another person to sin also constitutes a violation in the realm of interpersonal relationships (bein adam lechaveiro). When a person sins, he not only damages the world, but he damages himself. It is not simply that Hashem ‘punishes’ people for their sins, rather He has placed a spiritual system of action and consequence. This system is identical to the system present in the physical world. If a person steps off a high wall he will harm himself – it is not considered as if he was punished, rather he committed an action that had negative consequences. In a similar way, when a person sins, he steps of a metaphorical wall, and causes himself harm. Accordingly, helping someone sin, causes him harm, therefore it is forbidden.
 Much of the information for this essay is taken from “Halachos of Other People’s Money” by Rabbi Yisroel Pinchos Bodner.
 Kedoshim, 19:14.
 The Noachide Laws.
Text Copyright © 2009 by Rabbi Yehonasan Gefen and Torah.org
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