Leviticus 4:17-21

and the priest shall dip his finger in the blood and sprinkle it seven times before the Lord, in front of the veil.

He shall then put some of the blood on the horns of the altar which is before the Lord in the tent of meeting; and all the rest of the blood he shall pour out at the base of the altar of burnt offering which is at the doorway of the tent of meeting.

And he shall remove all its fat from it and offer it up in smoke on the altar.

He shall also do with the bull just as he did with the bull of the sin offering; he shall do the same with it. So the priest shall make atonement for them, and they will be forgiven.

Then he is to bring the bull out to a place outside the camp and burn it just as he burned the first bull; it is the sin offering for the assembly.