Deuteronomy 25:15

15 A perfect and just weight shall you have; a perfect and just measure shall you have: that your days may be long in the land which the LORD your God gives 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 shall not have in your bag diverse weights, a great and a small.

14 You shall not have in your house diverse measures, a great and a small.

15 A perfect and just weight shall you have; a perfect and just measure shall you have: that your days may be long in the land which the LORD your God gives you.

16 For all who do such things, [even] all who do unrighteously, are an abomination to the LORD your God.

17 Remember what `Amalek did to you by the way as you came forth out of Mitzrayim;