You shall not have two differing measures in your house, one large and one small.
Here is, I. A law against deceitful weights and measures: they must not only not use them, but they must not have them, not have them in the bag, not have them in the house (Deu 25:13, Deu 25:14); for, if they had them, they would be strongly tempted to use them.
Commenting on Deuteronomy 25:13-19
Thou shall not have in thine house divers, measures,.... Or, "an ephah and an ephah"; which was one sort of measure in use with the Jews, and held above a bushel; and is put for all others, which should be alike, and not a great and a small; one to buy with, and another to sell by, as before observed; which would be to cheat...
Deu 25:13-16 The duty of integrity in trade is once more enforced in Deu 25:13-16 (as in Lev 19:35-36). “Stone and stone,” i.e., two kinds of stones for weighing (cf. Psa 12:3), viz., large ones for buying and small ones for selling. On the promise in Deu 25:15, see Deu 4:26; Deu 5:16; Deu 25:16, as in Deu 22:5; Deu 18:12, etc.
Commenting on Deuteronomy 25:13-16