Mishnah — Seder Nezikin, Tractate ShevuotChapter 1…
“ He said to them: They may be offered. They said to him: Since their atonements are not equivalent, how can they be offered [one for the other] ? He said to them: They all come to atone for the impurity of the Temple and its sacred objects. Explanation the he-goats of the Festivals and the he-goats of the New Months: On each holiday, excepting the Sabbath, a he-goat is sacrificed as a public sin-offering. (See Numbers 28-29) a pure person who ate an impure [food] item: The "impure food" referred to is a sacred object (otherwise there would be no sin) . ”
