Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 86
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 86, with English translation by Maimonides (Rambam).
שלא להוציא בדי הארון, שנאמר "לֹא יָסֻרוּ מִמֶּנּוּ" (שמות כה, טו).
Not to remove the staves of the ark, as [Exodus 25:16] states: "They shall not be removed from it."