Deuteronomy 25:15

15 Yes, always use honest weights and measures, so that you may enjoy a long life in the 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 “You must use accurate scales when you weigh out merchandise,

14 and you must use full and honest measures.

15 Yes, always use honest weights and measures, so that you may enjoy a long life in the land the LORD your God is giving you.

16 All who cheat with dishonest weights and measures are detestable to the LORD your God.

17 “Never forget what the Amalekites did to you as you came from Egypt.