The sin offering was a prescribed sacrifice under the Mosaic law for atonement and cleansing from sin. It applied to individuals, the congregation, and the high priest, and was offered on several solemn occasions, especially the Day of Atonement.
The sin offering most clearly expressed propitiation and atonement. On the Day of Atonement its blood was carried into the holy of holies and sprinkled on the mercy-seat. Its repeated requirement impressed upon every sinner the need for pardon and restoration through the perfect sacrifice of Christ.
The ceremonial instructions are given chiefly in Leviticus 4 and 6. Sin offerings were also presented at annual festivals, at priestly consecration, and for various personal ritual situations; they were distinct from, though closely connected with, trespass offerings.