What kind of stones is the Torah referring to?
Rashi: It is referring to weights. 1
Whereas "Eifah ve'Eifah" in Pasuk 14, is referring to dry measures.
Bearing in mind that, in the following Pasuk, in connection with dry measures, the Torah writes "be'Veischa", why here, does it write "be'Kischa"?
Oznayim la'Torah: This supports Chazal, who, in Shabbos, 79, refer to the custom of merchants to place their weights in a leather pouch - to prevent erosion
What is wrong with having two different weights in one's pouch?
Rashi and Targum Yonasan: The Torah is speaking where both weights are of the same denominations, only there is a slight discrepancy between them, and where he uses the larger one for purchasing, and the smaller one for selling. 1
Sifri: It incorporates an Isur against retaining a Sela weight that has gone down in weight to less than a Shekel (a coin that equals half a Sela), and a Dinar that has gone down to less than a Tarp'ik (a coin that equals half a Dinar). 2
What are the implications of "Gedolah u'Ketanah"?
Sifri: It confines the prohibiition to where the two weights are the same and it is possible to use one for purchasing and the other for selling, 1 and the same applies to two different dry-measures - in the following Pasuk.
Why does the Torah insert these Dinim here?
Seforno: After dealing with Mitzvos that concern bringing the Shechinah down to Yisrael (and of causing its withdrawal 1 ) the Torah is teaching us that it is not only the actual perversion of justice that Hashem hates (and that causes the withdrawal of the Shechinah), but even the retention of vessels with which to cheat - and from which one should therefore distance himself. 2
