Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 192
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 192, with English translation by Maimonides (Rambam).
שלא לאכול עורלה, שנאמר "שלוש שנים, יהיה לכם ערלים--לא ייאכל" (ויקרא יט,כג).
Not to eat orlah for three years, as [Leviticus 19:23] states: "For three years, you must regard its fruit as a forbidden growth. It may not be eaten."