Deuteronomy 25:15

15 Instead, you must have only one weight, complete and correct, and only one ephah, also complete and correct, so that your life might be long in the fertile land the LORD your God is giving you.

Deuteronomy 25:15 Meaning and 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 delightful and fruitful land, and which a man might wish to live long in; deceitful men, are threatened with not living half their days, and such may they be said to be that use false weights and measures, ( Psalms 55:23 ) .

Deuteronomy 25:15 In-Context

13 Don't have two different types of money weights in your bag, a heavy one and a light one.

14 Don't have two different types of ephahs in your house, a large one and a small one.

15 Instead, you must have only one weight, complete and correct, and only one ephah, also complete and correct, so that your life might be long in the fertile land the LORD your God is giving you.

16 What's more, all who do such things, all who do business dishonestly, are detestable to the LORD your God.

17 Remember, after all, what Amalek did to you on your departure from Egypt: