Mishneh Torah — Negative Mitzvot מצוות לא תעשה, Chapter 174
The full Hebrew text of Mishneh Torah, Negative Mitzvot, Chapter 174, with English translation by Maimonides (Rambam).
שלא לאכול עוף טמא, שנאמר "ואת אלה תשקצו מן העוף, לא ייאכלו" (ויקרא יא,יג).
Not to eat non-kosher birds, as [Leviticus 11:13] states: "These birds you must regard as detestable. Do not eat them."