God enters the Garden and because of His love and mercy, He makes clothing from the skins of an animal that He killed. This shedding of blood was required because of the sin of Adam and Eve (Genesis 3:21). This temporary covering of sin by the blood of some animal allowed Adam and Eve to not die physically immediately. The skins represented the temporary covering of the blood of animals to appease God. However, animal blood is not sufficient for total forgiveness of sin. It only covers for a short time and the animal sacrifice must be repeated (Hebrews 10:11). Sin has a permanent cost so forgiveness for the sin but be permanent. Since animal sacrifices are temporary, we need something other than the blood of bull and goats (Hebrews 10:4).
We have a hint at the needed sacrifice in the story of Abraham offering Isaac to God. In Genesis 22, God tells Abraham that He desired the sacrifice of Isaac. The Bible plainly says this was a test to see if Abraham was willing to obey God (Genesis 22:1). Abraham obediently takes Isaac and a couple of servants to the place God had appointed. For the last part of the trip, Abraham put the wood on Isaac’s back and carried the fire leaving the servants behind. As they approached the location for the sacrifice, Isaac had a burning question. He says to his father, “Hey Dad, I know we are coming to sacrifice to God. We have the fire, the wood, and the knife; but I don’t see the sacrificial lamb” (Genesis 22:7). Abraham had told his servants that he and the lad would come back, so Abraham had stated his faith that somehow God would raise Isaac from the dead. God had an even more amazing plan. He wanted to teach Abraham that He is the Sacrificial Lamb. After Isaac asked the question, Abraham answers correctly although he did not know the truth in what he said. Abraham said, “My dear son, you are right. We are not taking a lamb to slaughter. God Himself will be that Sacrifice” (Genesis 22:8). The blood of animals can never totally forgive sin. Only God can do that. When Abraham was ready to slay Isaac, God called out that the sacrifice was in the bushes and to use the sacrifice that God provided.
This is a beautiful picture of what God has done for us. We deserve to die, yet He has taken our place. God became man and the sacrificial lamb (John 1:29). Christ bore our sins and completely forgave them (I Peter 2:24; Galatians 1:4). What the blood of animals could not do, God did by taking our place on the cross (Hebrews 9:11-15). Instead of having to offer a sin-sacrifice often, Christ paid the price once for all (Hebrews 10:10).