Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 12
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 12, with English translation by Maimonides (Rambam).
שלא ליתן אבן משכית, שנאמר "ואבן משכית לא תיתנו בארצכם" (ויקרא כו,א).
Not to make hewn stones [upon which to prostrate oneself], as [Leviticus 26:1] states: "You shall not place hewn stones..."