It was narrated that Ibn 'Abbas said:
"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. (FR)
English reference (FR): Vol. 3, Book 12, Hadith 2223 (FR)
Arabic reference (FR): Book 12, Hadith 2308 (FR)