Leviticus 1-4

The sacrifice described in chapter 4 is intended to atone for the unintentional sins of a memeber of the covenant people. The blood of the animal sacrifices described in chapters 1 and 3 was applied to the bronze altar in front of the tent. But the blood of the offerings in chapter 4 is used differently. For the sin of the priests and the whole community the blood was taken into the tent to the incense altar. There in front of the veil that hid God's mercy seat some of the blood was cast down before the Lord and some was used to annointed the horns of the incense altar. The blood of all the other offers was cast against the side of the main altar.
Stuart