John Gills Exposition of the Bible Commentary - Deuteronomy 25:15
But thou shall have a perfect and just weight, a perfect and just measure shall thou have ,.... That is, full weights, and full measures; and such as are alike, and everywhere used, according to the standard of the country; See Gill on Leviticus 19:36 , that thy days may be lengthened in the land which the Lord thy God giveth thee ; long life was always reckoned a blessing, and is frequently promised to, obedience, and particularly long life in the land of Canaan; which was a most... read more
Matthew Henry's Complete Commentary - Deuteronomy 25:13-19
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 (Deut. 25:13, 14); for, if they had them, they would be strongly tempted to use them. They must not have a great weight and measure to buy by and a small one to sell by, for that was to cheat both ways, when either was bad enough; as we read of those that made the ephah small, in which they measured the corn they sold, and... read more