Leviticus 1
Because this is a very detailed and technical record, I will paraphrase this for you.
Vs. 1-2 God spoke to Moses from the Tent of Meeting. He said that any individual person can bring an animal for his personal sacrifice, and it can be a calf or a lamb or a goat kid.
V. 3 It must be a male animal, that doesn't have any kind of imperfection, it must be perfectly healthy.
V. 4 This person must lay his hand on the head of the animal to identify with it, and it will be accepted as his substitute to pay his sin debt.
V. 5 Then he is to slaughter this young bull or lamb or goat kid, dying in his place; and the priest is to bring its blood in a bowl to the altar, and sprinkle this blood all around the sides of the altar. This blood will cover the man's sins so that he can now be forgiven.
Vs. 6-9 Then the priest will skin the animal and cut it into pieces, the sons of Aaron (the other priests) will kindle a fire on the altar, and arrange the pieces of the animal on the fire, including the head and all its fat. He is to wash its inner organs and legs and put them on the altar, too, to all burn up completely, as a pleasing aroma to the Lord.
Vs. 10-13 Whether it is a calf, a lamb or a goat, it must be slaughtered on the North side of the altar, and its blood splashed all around on the sides of the altar to cover the sins of the person. Then it is to be all burned up completely.
Vs. 14-17 The person can even bring a bird if they cannot afford a mammal, a dove or a young pigeon. The priest is to wring off its head and drain out its blood on the side of the altar. The bird's crop is to be thrown to the East side of the altar, where the ashes are. Then he is to tear it open by its wings, but keep it together, to burn completely in the fire on the altar.
Jesus fulfilled this first, foundational sacrifice that every individual person was to bring. Jesus is our Lamb, sacrificed completely for us individually, His precious Blood splashing the sides of His altar, the Cross.
Every person is deserving of death for their personal sins, and for the sin-nature he is born into. God is so Holy, nothing that has any hint of sin is able to live with Him in Heaven. These people who brought the animal sacrifices could have their sins covered by the animal's blood so they could be forgiven, but they still couldn't go to Heaven when they died, they went to Sheol, the Place of the Dead.
Jesus described Sheol for us with His story about the Rich Man and Lazarus, with two distinct sides separated with an uncrossable gulf. Those who admitted they deserved death when they put their hand on the head of the sacrifice went to the Paradise side, but the rest had to go to the fire side.
Jesus told the "Good Thief" that He would be with him that day in Paradise, in Sheol. When Jesus died, while His body was buried in that cave, sealed with a stone, He was gathering all the forgiven people in Paradise to bring them to Heaven, since His precious Blood did not just cover, but actually washed away their sins.
As it takes away all of our sins today. When we agree with God that we deserve death, and figuratively lay our hand on His head as our Sacrifice, then His Blood cleanses us of all our sins and unrighteousness and makes us white as snow, white as wool, purified from anything and everything that would make us less than perfect, without spot or wrinkle. Suited and fit for life with God Himself, in His Heaven, even in the New Heaven and New Earth.
This has been His Plan from the beginning. And He is completing all the final touches of His design.
Even so, come, Lord Jesus!
