'Sin offerings' in the Bible

For the showbread, and for the continual grain offering, and for the continual burnt offering, of the sabbaths, of the new moons, for the set feasts, and for the holy things, and for the sin offerings to make an atonement for Israel, and for all the work of the house of our God.

Because Ephraim has made many altars for sin offerings, the altars shall be unto him for sinning.