Gezel

You shall not steal; you shall not deal deceitfully or falsely with one another.

You shall not defraud your fellow. You shall not commit robbery. The wages of a laborer shall not remain with you until morning.

לא תעשק THOU SHALT NOT WRONG [THY FELLOW-MAN] — This refers to one who withholds the wages of a hired servant (Sifra, Kedoshim, Section 2 9; Bava Metzia 61a).

It is forbidden to steal even if it is a small amount according to the judgment of the Torah and it is forbidden to steal, even if it is in a playful manner, even on the condition of returning it or in order to repay double or in order to cause pain. Everything is forbidden in order that he not accustom himself to this.

It’s forbidden to steal or exploit (even) any amount, whether from a Jew or a non-Jew; And if it is an object that is not concerning, it is permitted; such as to take from the package or [taking a splinter] from the fence to brush his teeth with; and even this is prohibited by the Jeruselamite (Talmud), as a quality of fervency.

It is prohibited to steal, even on condition of fair payment from (for) it. And there is one who says, (that) this is if the payments are not evident; because if they are evident, since they (the payments) are preferred over the object since they attain a right for him and he would confer them onto the owners by way of another.

Anyone who steals from his friend, even a penny-worth, is considered as having taken his soul.

Even if he's in dire danger and needs to steal from his friend in order to save his soul, he should not take it unless with the intent to pay.

The Gemara asks: Why do I need the prohibition: “You shall not steal” (Leviticus 19:11), that the Merciful One wrote? This is yet another prohibition against taking money by illegitimate means, and it could be derived from the other prohibitions mentioned previously. The Gemara answers that it is necessary for the Merciful One to write that prohibition for that which is taught in a baraita: “You shall not steal” applies in all circumstances, even if you do so only in order to aggravate the victim; “you shall not steal” applies in all circumstances, even if you do so in order to pay the double payment as a gift to the person from whom you stole.

Even the one who takes via borrowing, without the knowledge of the owners, is called a thief.

One who enters his fellow's house and takes a vessel, a piece of food or something like this and uses it to betroth a woman, and then the homeowner comes, even if he says to him: Why didn't you give her this thing that is better than the thing you gave her, she is not betrothed, for he said this only so that the other wouldn't be embarrassed. And since he betrothed her using his friend's property without his friend's acknowledgment, behold he has stolen and she is not betrothed. But if he betrothed her with something that the homeowner doesn't really care about, like a date or a nut, behold she is doubtfully betrothed. Hagah: A guest who is sitting with a homeowner [dining], and he takes his portion [of food] and uses it to betroth [her], behold she is betrothed [Hagahot Alfasi].