'Sin offering' in the Bible

But the flesh of the bull and its hide and its refuse, you shall burn with fire outside the camp; it is a sin offering.

Each day you shall offer a bull as a sin offering for atonement, and you shall purify the altar when you make atonement for it, and you shall anoint it to consecrate it.

Aaron shall make atonement on its horns once a year; he shall make atonement on it with the blood of the sin offering of atonement once a year throughout your generations. It is most holy to the Lord.”