Deuteronomy 25:13

Divers weights - אבן ואבן eben vaaben, a stone and a stone, because the weights were anciently made of stone, and some had two sets of stones, a light and a heavy. With the latter they bought their wares, by the former they sold them. In our own country this was once a common case; smooth, round, or oval stones were generally chosen by the simple country people for selling their wares, especially such as were sold in pounds and half pounds. And hence the term a stone weight, which is still in use, though lead or iron be the matter that is used as a counterpoise: but the name itself shows us that a stone of a certain weight was the material formerly used as a weight. See the notes on Leviticus 19:35, Leviticus 19:36.

Honesty in trade, as a duty to our neighbor, is emphatically enforced once more (compare Leviticus 19:35-36). It is noteworthy that John the Baptist puts the like duties in the forefront of his preaching (compare Luke 3:12 ff); and that "the prophets" (compare Ezekiel 45:10-12; Amos 8:5; Micah 6:10-11) and "the Psalms" Proverbs 16:11; Proverbs 20:10, Proverbs 20:23, not less than "the Law," especially insist on them.

Deuteronomy 25:13

Divers weights - i. e. stones of unequal weights, the lighter to sell with, the heavier to buy with. Stones were used by the Jews instead of brass or lead for their weights, as less liable to lose anything through rust or wear.

25:13 A great and a small - The great to buy with, the small for selling.