Commentary explaining the meaning of the ayahs. One passage often covers several ayahs, so neighbouring ayahs can show the same text.
English Al-Mukhtasar tafsir for Surah Al-Mutaffifin — Ayah 3
وَإِذَا كَالُوهُمۡ أَو وَّزَنُوهُمۡ يُخۡسِرُونَ ٣
But when they measure or weigh for people they reduce the measurement and weight. This was the practice of the people of Madinah at the time the Prophet (peace be on him) migrated to them.