leviticus 4:27 And if any one of the common people sin through ignorance, while he doeth somewhat against any of the commandments of the LORD concerning things which ought not to be done, and be guilty; - Free Bible Online

      27-34. if any one of the common people sin through ignorance--In this case the expiatory offering appointed was a female kid, or a ewe-lamb without blemish; and the ceremonies were exactly the same as those observed in the case of the offending ruler [Le 4:22-26]. In these two latter instances, the blood of the sin offering was applied to the altar of burnt offering--the place where bloody sacrifices were appointed to be immolated. But the transgression of a high priest, or of the whole congregation, entailing a general taint on the ritual of the tabernacle, and vitiating its services, required a further expiation; and therefore, in these cases, the blood of the sin offering was applied to the altar of incense [Le 4:6, 17].

JFB.