You are not to steal.

In the natural sense this commandment means literally not stealing, engaging in brigandage or piracy in peacetime; and in general not depriving anyone of his goods secretly or on any pretext. It also extends to all imposture and unlawful gain, usury and extortion, as well as fraud in payment of dues and taxes and in repaying debts. Workers who do not work in good faith and without deceit offend against this commandment; so do merchants who cheat over their wares, weights, measures and calculations; so do officers who withhold their troops' pay; and judges who are influenced in their judgments by friendship, bribery, nepotism or other reasons, so perverting laws or legal processes, and depriving others of the lawful possession of their goods.