Keritot is a tractate of the Mishnah and Babylonian Talmud.
It is the seventh tractate in the Order of Kodashim.
Its name is the plural of the punishment kareth which the Torah specifies for intentional violation of certain sins; unintentional violation of the same sins obligates one to bring a sin-offering instead.
Page 6 of Keritot concerns the incense offering of the Temple.
This is included in the standard Orthodox prayer book.