21. It is permissible for a Jew to supervise, on Shabbos, a Gentile
milking cows and making cheese from milk owned by the Gentile; this is
true, even though the Gentile is [making the cheese] with intent to sell it
to the Jew, and the Jew is [supervising] so that the cheese will be
permissible for a Jew, and thus he will be able to purchase it after
Shabbos; the reason that this is permitted, is because the cheese is still
owned by the Gentile, and he is making it for his own benefit (1).
It is even permissible for a Jew to tell him to make the cheese on Shabbos,
since it is permissible to tell a Gentile: "Perform your work," even though
ultimately a Jew will benefit from it.