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Which was revealed in Al-Madinahبِسْمِ اللَّهِ الرَّحْمَـنِ الرَّحِيمِIn the Name of Allah, the Most Gracious, the Most Merciful.Increasing and decreasing in the Measure and Weight will be a Cause for Regret and LossAn-Nasa'i and Ibn Majah both recorded from Ibn `Abbas that he said, "When the Prophet came to Al-Madinah, the people of Al-Madinah were the most terrible people in giving measurement (i.e., they used to cheat). Thus, Allah revealed,وَيْلٌ لِّلْمُطَفِّفِينَ(Woe to Al-Mutaffifin.

Source: Tafsir Ibn Kathir — abridged excerpt