When Shavuos falls on Shabbos, two bread distributions happen simultaneously — the Lechem HaPanim (matzah, from the previous Shabbos's baking) and the Shtei HaLechem (chametz, the Festival's new wheat offering). One Kohein distributes to each arriving Kohein: "Here is matzah for you — here is chametz for you." Both are handed to the same person in the same moment. This is the only time in the Temple calendar where two bread distributions — one matzah, one chametz — occur simultaneously for all 24 Mishmaros. The Mishnat Eretz Yisrael notes that the phrase may be repeated (as a ceremonial doubling, consistent with the repetition patterns seen throughout Temple service).