Hebrews 9:22 And according to the law almost all things are purified with blood, and without shedding of blood there is no remission.
Hebrews 10:3-4 But in those sacrifices there is a reminder of sins every year. For it is not possible that the blood of bulls and goats could take away sins.
Genesis 4:10 And He said, “What have you done? The voice of your brother’s blood cries out to Me from the ground.
Genesis 9:5 Surely for your lifeblood I will demand a reckoning; from the hand of every beast I will require it, and from the hand of man. From the hand of every man's brother I will require the life of man.