The First Blood and the Last Blood

The first human blood shed in the Bible was a shepherd's blood, shed by one who rejected God in jealousy and anger.

Now Abel was a keeper of sheep, and Cain a worker of the ground. (Genesis 4:2b)
And the Lord said, “What have you done? The voice of your brother’s blood is crying to me from the ground. (Genesis 4:10)

The Death of Abel - Gustave Doré (1832-83)

The last blood needed for sin's atonement was the blood of Jesus.

and not through the blood of goats and calves, but through His own blood, He entered the holy place once for all, having obtained eternal redemption. For if the blood of goats and bulls and the ashes of a heifer sprinkling those who have been defiled sanctify for the cleansing of the flesh, how much more will the blood of Christ, who through the eternal Spirit offered Himself without blemish to God, cleanse your conscience from dead works to serve the living God? (Hebrews 9:12-14)

But now in Christ Jesus, you who once were far off have been brought near by the blood of Christ. (Ephesians 2:13)

Chris Powers, fullofeyes.com

The Last Blood. Listen to it entirely. It builds to a devastating climax.