Sforno on Leviticus 19:35/ספורנו על ויקרא י״ט:ל״ה

1לא תעשו עול במשפט במדה במשקל ובמשורה, seeing that the term אונאה, unfair dealings, also includes unfair business practices, the Torah issues a general prohibition concerning this addressed both to the locally born Jew and the recent convert, or stranger. The words used include measures for measuring liquids, dry matters, as well as the use of deceptive weights.