Leviticus 4:13-14

13And if the whole assembly of Israel sin inadvertently, and the thing be hid from the eyes of the congregation, and they do [somewhat against] any of all the commandments of Jehovah [in things] which should not be done, and are guilty;

14and the sin wherewith they have sinned against it have become known; then the congregation shall present a young bullock for the sin-offering, and shall bring it before the tent of meeting;