﴿ ۞ أَوْفُوا۟ ٱلْكَيْلَ وَلَا تَكُونُوا۟ مِنَ ٱلْمُخْسِرِينَ ﴾

““[Always] give full measure, and be not among those who [unjustly] cause loss [to others];”

Give full measure) when you measure or weigh, (and be not of those who give less (than the due)) in measurement and weighing; this is because they were well known for giving less than what is due in measurement.