THE COVERING OF SKIN:
For Adam and Eve, participation in the salvation that was being offered by God necessitated the “shedding of blood” by means of an animal sacrifice and the covering of skins. The shedding of blood elsewhere in the Bible is associated with forgiveness. IE “without shedding of blood there is no forgiveness”: Hebrews 9:22. The principle is that the life of the animal/human is in the blood: Leviticus 17:11, 14. The condemnation pronounced in Eden is summarized in Ezekiel 18:4, 20 “The soul who sins will die”. It is for this reason that fig leaves were an inadequate covering, and that God covered them with skins which necessitates that an animal had to die for their sin to be overlooked.
IE: “being justified as a gift by (God’s) grace through the redemption which is in Christ Jesus; whom God displayed publicly as a propitiation in His blood through faith. This was to demonstrate His righteousness, because in the forbearance of God He passed over the sins previously committed;” Romans 3:24. The animal sacrifice and the blood poured out symbolizes the work of the coming Messiah who is described as: “the Lamb slain from the foundation of the world.” Revelation 13:8
It can be determined then that there must be the “pouring out” of blood/life IE emptying of oneself of things related to the flesh as testified of Jesus Christ who poured out his soul/life unto death, Isaiah 53:12. When we are baptized into Jesus, we become associated with him by confessing our sins and seeking for forgiveness, because his blood “cleanses us from all sin” 1 John 1:7.