Hebrews 12:22-24
But you have come to Mount Zion, to the city of the living God, the heavenly Jerusalem. You have come to thousands upon thousands of angels in joyful assembly, to the church of the firstborn, whose names are written in heaven. You have come to God, the Judge of all, to the spirits of the righteous made perfect, to Jesus the mediator of a new covenant, and to the sprinkled blood that speaks a better word than the blood of Abel.
Two nations born out from one womb. Cain and Abel. Jacob and Esau. The story of the Lost Son. The Old and the New Jerusalem. Objects of His mercy and objects of His wrath. What were common in all these? The war between the sinful nature of the Devil and the divine nature of Christ. This had started from the garden of Eden and still continues till this day until Christ our Lord appears again triumphantly, only this time, putting an end to this war eternally. Bringing along the necessary judgments. The end will finally come for the sinful nature of the Devil in man. Everyone who liked and basked in it will be judged. All our deeds on Earth we would need to give account to God. Those who did not have the power of the blood of the Lamb of God over the sinful nature of the Devil in them will be paying a price eternally. There will be others who have trusted in the power of the blood of the Lamb all their lives. God Himself will judge all these, whether you had or not. It is possible to have the spirits of the righteous made perfect through the "sprinkled blood that speaks a better word than the blood of Abel".
Romans 9:10-16
Not only that, but Rebekah's children were conceived at the same time by our father Isaac. Yet, before the twins were born or had done anything good or bad--in order that God's purpose in election might stand: not by works but by him who calls--she was told, "The older will serve the younger." Just as it is written: "Jacob I loved, but Esau I hated." What then shall we say? Is God unjust? Not at all! For he says to Moses, "I will have mercy on whom I have mercy, and I will have compassion on whom I have compassion." It does not, therefore, depend on human desire or effort, but on God's mercy.
Hebrews 11:4
By faith Abel brought God a better offering than Cain did. By faith he was commended as righteous, when God spoke well of his offerings. And by faith Abel still speaks, even though he is dead