Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 110
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 110, with English translation by Maimonides (Rambam).
שלא למכור שדה החרם, שנאמר "לא יימכר" (ויקרא כז,כח).
Not to sell a field that has been dedicated, as [Leviticus 27:28] states: "It shall not be sold."