Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 221
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 221, with English translation by Maimonides (Rambam).
שלא לעבוד אילן בשביעית, שנאמר "וכרמך לא תזמור" (ויקרא כה,ד).
Not to cultivate trees in the seventh year, as [Leviticus, ibid.] continues: "Do not prune your vineyard."