وَأَوْفُوا الْكَيْلَ إِذَا كِلْتُمْ وَزِنُوا بِالْقِسْطَاسِ الْمُسْتَقِيمِ ۚ ذَٰلِكَ خَيْرٌ وَأَحْسَنُ تَأْوِيلًا (35)
(17:35) 12. Give full measure when you measure and weigh with even scales *40 when you weigh. This is the best way and will prove to be the best in the end. *41
*40) This instruction was not confined to individuals only but it has been made a part of the duties of an Islamic Government to supervise transactions in the markets and streets to see that exact measures and weights are being observed, and prevent their breach and violation by the force of law. Afterwards it was made one of the duties of the government to eradicate dishonesty in all commercial dealings and economic transactions.
*41) That is, "Its end will be best in this world and it will be best in the Hereafter. " It is best in this world because it produces mutual rust between sellers and buyers. As a result of this, commerce prospers and there is a general prosperity. As regards the Hereafter, there the end depends wholly on honesty, piety and fear of God.