leviticus 4:13 And if the whole congregation of Israel sin through ignorance, and the thing be hid from the eyes of the assembly, and they have done somewhat against any of the commandments of the LORD concerning things which should not be done, and are guilty; - Free Bible Online

      13-21. if the whole congregation of Israel sin through ignorance--In consequence of some culpable neglect or misapprehension of the law, the people might contract national guilt, and then national expiation was necessary. The same sacrifice was to be offered as in the former case, but with this difference in the ceremonial, that the elders or heads of the tribes, as representing the people and being the principal aggressors in misleading the congregation, laid their hands on the head of the victim. The priest then took the blood into the holy place, where, after dipping his finger in it seven times, he sprinkled the drops seven times before the veil. This done, he returned to the court of the priests, and ascending the altar, put some portion upon its horns; then he poured it out at the foot of the altar. The fat was the only part of the animal which was offered on the altar; for the carcass, with its appurtenances and offals, was carried without the camp, into the place where the ashes were deposited, and there consumed with fire.

JFB.