"When the Prophet ﷺ came to Al-Madinah, they were the worst people in weights and measures. Then Allah, Glorious is He revealed: "Woe to the Mutaffifun (those who give less in measure and weight)",[1] and they were fair in weights and measures after that.  

لَمَّا قَدِمَ النَّبِيُّ ﷺ الْمَدِينَةَ كَانُوا مِنْ أَخْبَثِ النَّاسِ كَيْلاً فَأَنْزَلَ اللَّهُ سُبْحَانَهُ {وَيْلٌ لِلْمُطَفِّفِينَ} فَأَحْسَنُوا الْكَيْلَ بَعْدَ ذَلِكَ