Rom 5:13 (For until the law sin was in the world: but sin is not imputed when there is no law.
Rom 5:14 Nevertheless death reigned from Adam to Moses, even over them that had not sinned after the similitude of Adam's transgression, who is the figure of him that was to come.
Even though there was no law to break at that time, nevertheless death reigned from Adam to Moses. Death reigned because of what? Sin.
Without the shedding of blood, there is no remission of sin.
Who revealed the very first sign that a blood sacrifice was going to be needed?
Gen 3:21 And the LORD God made clothing from animal skins for Adam and his wife.
The Lord God shed blood to make a covering for Adam, and Eve.
God told Abel what to offer as a sacrifice which he did by faith because faith only comes by hearing and hearing by the word of God. Cain also knew what to offer but refused to be obedient.
Gen 4:5 but he did not accept Cain and his gift. This made Cain very angry, and he looked dejected.
Gen 4:6 “Why are you so angry?” the LORD asked Cain. “Why do you look so dejected?
Gen 4:7 You will be accepted if you do what is right. But if you refuse to do what is right, then watch out! Sin is crouching at the door, eager to control you. But you must subdue it and be its master.” (NLT)
New American Standard Bible Hebrews 10 :4,5
For it is impossible for the blood of bulls and goats to take away sins.
5Therefore, when Christ came into the world, He said:
“Sacrifice and offering You did not desire, but a body You prepared for Me.…
Hebrews 10:11
Day after day every priest stands to minister and to offer again and again the same sacrifices, which can never take away sins.
Hebrews 10:8
Above when he said, Sacrifice and offering and burnt offerings and
offering for sin thou wouldest not, neither hadst pleasure
therein; which are offered by the law;
Psalm 50:8
…7“Hear, O My people, and I will speak, O Israel, and I will testify against you: I am God, your God. 8
I do not rebuke you for your sacrifices,and your burnt offerings are ever before Me. 9I have no need for a bull from your stall or goats from your pens,…
and I can go all day like this:
Psalm 40:6
…5Many, O LORD my God, are the wonders You have done, and the plans You have for us—none can compare to You—if I proclaim and declare them, they are more than I can count. 6
Sacrifice and offering You did not desire, but my ears
You have opened. Burnt offerings and sin offeringsYou did not require.
Hebrews 10:5
Therefore, when Christ came into the world, He said: "Sacrifice and offering You did not desire, but a body You prepared for Me.
PS Death still reign even today, just look around . The grave yards are full and the news is too and The morgues are too.