Negative commandment · Lo Ta’aseh #148 of 613
For an unauthorized person not to eat the meat of the sacrifices of the highest order of sanctity
שלא יאכל זר בשר קודשי קודשים
The verse · Shemot 29:33
וְאָכְלוּ אֹתָם אֲשֶׁר כֻּפַּר בָּהֶם לְמַלֵּא אֶת־יָדָם לְקַדֵּשׁ אֹתָם וְזָר לֹא־יֹאכַל כִּי־קֹדֶשׁ הֵם
“And they shall eat those things with which atonement was made to consecrate and to sanctify them: but a stranger shall not eat of them, because they are holy.”
The Rambam’s words
For an unauthorized person not to eat the meat of the sacrifices of the highest order of sanctity, as [Exodus 29:33] states: "An unauthorized person shall not partake of them, for they are holy."
שלא יאכל זר בשר קודשי קודשים, שנאמר "וזר לא יאכל, כי קודש הם" (שמות כט,לג).
Where in the Mishneh Torah
Hilchot Sacrificial Procedure הלכות מעשה הקרבנות