Negative commandment · Lo Ta’aseh #137 of 613
That a profaned woman not eat from the holy
שלא תאכל חללה קודש, לא תרומות ולא חזה ושוק
The verse · Vayikra 22:12
וּבַת־כֹּהֵן כִּי תִהְיֶה לְאִישׁ זָר הִוא בִּתְרוּמַת הַקֳּדָשִׁים לֹא תֹאכֵל
“And if a priest’s daughter be married to a stranger, she may not eat of an offering of the holy things.”
The Rambam’s words
For a chalalah not to partake of consecrated foods, neither terumah, nor the breast and the shankbone [given to the priest], as [Leviticus 22:12] states: "When a priest's daughter marries an unauthorized person, she shall not eat [from the sacred, elevated gifts]."
שלא תאכל חללה קודש, לא תרומות ולא חזה ושוק, שנאמר "ובת כוהן--כי תהיה, לאיש זר" (ויקרא כב,יב).
Who & when
“And this commandment is practiced in every place [and at all times] where there is priestly tithe from Torah writ, as we said in the previous commandments.”
Where in the Mishneh Torah
Hilchot Heave Offerings הלכות תרומות