Blood is important to God.
Genesis 9:3-4 says: “Every moving thing that lives shall be food for you. And as I gave you the green plants, I give you everything. But you shall not eat flesh with its life, that is, its blood.”
His blood was shed for our sins. John 19:34 tells us about Jesus on the Cross after His death: “But one of the soldiers pierced his side with a spear, and at once there came out blood and water.”
He was pierced for our transgressions. His blood covers our sin. It was the only righteous sacrifice strong enough and good enough to cover our sins. It satisfied the wrath of God perfectly.
God is serious about blood. All covenants were ratified by blood in the old testament.
The new covenant to us is ratified by the blood of Jesus.
-Mark (covered by His blood)