Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 266
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 266, with English translation by Maimonides (Rambam).
שלא להתאוות, שנאמר "לֹא תִתְאַוֶּה בֵּית רֵעֶךָ" (דברים ה, יז).
Not to desire, as [Deuteronomy 5:18] states: "Do not desire your neighbor's house."