Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 40
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 40, with English translation by Maimonides (Rambam).
להקריב כהן גדול מנחה בכל יום, שנאמר: "זֶה קָרְבַּן אַהֲרֹן וּבָנָיו" (ויקרא ו, יג).
For the High Priest to offer a meal offering each day, as [Leviticus 6:13] states: "This is the sacrifice of Aaron and his descendants."