Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 95
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 95, with English translation by Maimonides (Rambam).
שלא להקריב בעל מום עובר, שנאמר "לא תזבח לה' אלוהיך שור ושה, אשר יהיה בו מום" (דברים יז,א); זה הוא מום עובר.
Not to offer animals with disqualifying physical blemishes of a temporary nature as sacrifices, as [Deuteronomy 17:1] states: "Do not sacrifice to God, your Lord, an ox or a sheep that has a blemish." This refers to a blemish of a temporary nature.