Leviticus 4:27-31

‘Now if anyone of the common people sins unintentionally by doing any of the things which the Lord has commanded not to be done, and becomes guilty,

if his sin which he has committed is made known to him, then he shall bring as his offering a goat, a female without defect, for his sin which he has committed.

And he shall lay his hand on the head of the sin offering and slaughter the sin offering at the place of the burnt offering.

The priest shall then take some of its blood with his finger and put it on the horns of the altar of burnt offering; and all the rest of its blood he shall pour out at the base of the altar.

Then he shall remove all its fat, just as the fat was removed from the sacrifice of peace offerings; and the priest shall offer it up in smoke on the altar as a soothing aroma to the Lord. So the priest shall make atonement for him, and he will be forgiven.