Numbers 15:14

If a stranger sojourn with you— This evidently means a stranger proselyted to the Jewish religion; and by the wisdom of this law, it is not only provided, that there should be no distinction between the natives and such proselytes, but also that there should be no innovations in the Jewish religion; for had not strangers, who resided within the Jewish territories, been obliged to conform to the same ceremonies of public worship with the Jews, their example might have had a pernicious influence, to corrupt that form of worship which was instituted by God himself.