'Sin offering' in the Bible

But the flesh of the bullock, and its skin, and it dung, shalt thou burn with fire without the camp: it is a sin-offering.

And every day shalt thou offer the bullock of sin-offering for atonement: and thou shalt cleanse the altar, when thou makest atonement for it; and thou shalt anoint it, to sanctify it.

And Aaron shall make atonement upon the horns of it once in the year; with the blood of the sin-offering of atonement once in the year shall he make atonement for it throughout your generations: it is most holy unto Jehovah.