Leviticus 6:25. This is the law of the sin offering.
There were two kinds of sin offering: one for the whole congregation and the other for individuals. For the first kind a young bullock was brought into the outer court of the Tabernacle, where the elders laid their hands upon his head and he was killed. The high priest then took the blood into the Holy Place and sprinkled it seven times before the wail, putting some on the horns of the golden altar of incense. The remainder of the blood was then poured out at the foot of the altar of burnt offering. The fat of the animal was burnt upon the altar, and the rest of the body was taken without the camp and burnt (Lev. 4:13-21).
Of the second kind of sin offering there were three varieties. The first was for the high priest. The ceremonies only slightly varied from those just described (Lev. 4:3-12). The second was for any of the rulers of the people. A kid was killed instead of a bullock. The priest did not enter the Holy Place, but merely put some of the blood on the horns of the altar of burnt offering, and poured the rest out by the foot of the altar. The fat was burned upon the altar (Lev. 4:22-26). The third was for any of the common people. A female kid or lamb was brought and treated as in the case just described (Lev. 4:27-35). If poverty prevented the procuring of kid or lamb, two turtle doves or two young pigeons could be substituted; and for the very poorest a small offering of fine flour (Lev. 5:7-13).
What was left of the sin offering for one of the rulers or for one of the common people was not burned without the camp, as in the two other instances, but was eaten by the priests and their sons. It was considered peculiarly holy, and special directions were given concerning the vessels in which it was cooked (Lev. 6:24-30). The sin offering was offered for sins of ignorance against negative precepts (Lev. 4:2,13,22,27).