Shulchan Aruch of Rabbi Shneur Zalman of Liadi, Volume 12: Choshen Mishpat

in weight.

That source also states that if returning a gentile’s lost object will lead to the sanctification of G-d’s name, it is desirable to do so. Seemingly, this concept would also apply with regard to returning profit resulting from a gentile’s error in calculation. See

Nevertheless, if when dealing with a gentile, the gentile makes an error in counting, weighing or measuring merchandise and is willing to purchase it for more than its value, it is not necessary to correct him and inform him of its true worth. Although this standard of righteousness is required when dealing with a Jew, it is not mandatory when deal

According to Shiurei Torah, p. 118, a litra is a pound in contemporary measure.

Imrei Yaakov (note 10) suggests that the obligation to accompany the animal

[Using a false weight or measure] is not comparable to taking unfair gain from [a gentile which is allowed]. For in that instance, [the gentile] sees what he is buying and errs on his own with regard to the value of the merchandise. [Taking advantage of a judgment] error [of this type made by a gentile] is permitted, as is [taking possession of] an

Weights should be made in denominations of a litra, 51 half a litra, and a fourth of a litra. 52 One should not make them a third of a litra, a fifth of a litra, or three fourths of a litra, because errors can be made in such instances.53

necessary to measure generously, [giving the purchaser slightly] more than the measure, as it is written:36 “You shall have a perfect and just measure.” What is meant by a “just measure?” That you should justify [the measure] from your own and give it [to the customer].

Even a person who rebukes a transgressor149 must rebuke him privately,150 not in