Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 84
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 84, with English translation by Maimonides (Rambam).
שלא לסוך בשמן המשחה זר, שנאמר "על בשר אדם, לא ייסך" (שמות ל,לב).
Not to anoint an unauthorized person with the anointing oil, as [Exodus 30:32] states: "Do not anoint the flesh of a person with it."