Commento su Levitico 19:36

אבני צדק are stones used for weights wherewith one weighs.

הין, another measure used for measuring liquids.

That is a dry measure. Because it says [regarding manna] (Shemos 16:36), “The omer is a tenth of an eiphoh.”

איפת — The “Epha” is a certain dry measure.

That is a liquid measure. As it says [regarding oil and wine] (see Bamidbar 28:5, 6), “One fourth of a hin.”

והין — The “Hin” is a certain liquid measure.

Who dips his weights in salt to cheat people. Some explain that the buyer dips his weights in salt so that they should be heavy because of the dampness of the salt. Others explain that the seller dips his weights in salt as salt is strong and sharp and erodes the weight and makes it lighter, and he sells to people by weighing with this [lighter] weight.

אשר הוצאתי אתכם WHO BROUGHT YOU FORTH [FROM EGYPT] for this purpose, that you shall be honest in your actions (Sifra, Kedoshim, Chapter 8 10). Another explanation is: I distinguished in Egypt between those who were firstborn and those who were not firstborn (a matter which is hidden from human cognizance), I am also certain to exact punishment from him who secretly puts his weights in salt in order to take advantage of people who are not aware of it (cf. Bava Metzia 61b).