Mishneh Torah — Positive Mitzvot מצוות עשה, Chapter 46
The full Hebrew text of Mishneh Torah, Positive Mitzvot, Chapter 46, with English translation by Maimonides (Rambam).
להביא שתי הלחם עם הקרבנות הקרבים בגלל הלחם ביום עצרת, שנאמר: "מִמּוֹשְׁבוֹתֵיכֶם תָּבִיאוּ לֶחֶם תְּנוּפָה" (ויקרא כג, יז) "וְהִקְרַבְתֶּם עַל הַלֶּחֶם" (שם, יח).
To bring two loaves and the sacrifices which accompany the loaves on Shavuot, as [Leviticus 23:17] states: "From your dwellings, bring bread as a wave offering. And you shall offer upon the bread...."