Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 96
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 96, with English translation by Maimonides (Rambam).
שלא להקריב בעל מום מיד הגויים, שנאמר "ומיד בן נכר, לא תקריבו" (ויקרא כב,כה).
Not to offer an animal with a disqualifying physical blemish as a sacrifice when it was brought by gentiles, as [Leviticus 22:25] states: "Do not offer sacrifices [from these animals] when they are given by gentiles."