For an explanation of the sacrifices of Cain and Abel please see intro7
Cain means spear and Abel (Hebel) means breathing. We think that Eve called her first son Cain because he was created by her being pierced for the first time by Satan. Furthermore she had never seen a man's organ become a spear prior to that time! Then Abel was created in an entirely different emotional environment. One that began with a kiss, a mouth to mouth kiss, a sharing of breath, a mutual breathing, a Hebel! a kiss of love, that lead to Eve having sex with someone who actually loved her, Adam. Satan did not kiss her. Satan got the first penetration. Adam got the first kiss.
The Cain became a murderer as his name would require, since a spear is an instrument of death. But Abel became a life giver as his name would require since breathing is life and the Hebrew word for a soul is Nephesh which means a breather and Abel was the faith covenant system mediator for the pre flood system. He got the Abelian Faith Covenant. So everyone resurrected as a human, a breather, from that system began in Abel's body.
25 And Adam proceeded to have intercourse again with his wife and so she gave birth to a son and called his name Seth, because, as she said: God has appointed another seed underneath Abel, because Cain killed him. (Genesis 4 NWT).
25 [d;YEw: ~d'a' dA[ ATv.ai-ta, dl,Tew: !Be ar"q.Tiw: Amv.-ta, tve yKi yli-tv' ~yhilOa/ [r:z< rxea; tx;T; lb,h, yKi Agr"h] !yIq' (Genesis 4 WLC).
The Hebrew word for 'appointed' is tyvi fut. tyviy", apoc. tvey", tv,Y"w: inf. absol. tvO Isa. 22:7, to put, to set, to place. (Gesenius). tyvi is pronounced Seeth - hence Seth.
Seth was appointed by God underneath Abel not genetically but in salvation covenant terms because both Abel and Seth were mediators of pre flood salvation covenants. You have to enter into the AFC (Abelian Faith Covenant) before you can enter in to the SAC (Sethian Angelic Covenant) - see Intro28. So Seth was underneath Abel in covenant mediation terms. This was not what Eve was (in her mind) referring to - But the scriptures are inspired of God! Eve was thinking that Seth would replace Abel as her firstborn son from Adam. But God modified her expression of this thought real time so that she actually referred also to the salvation covenant mediation of her two sons unwittingly. God appointed Abraham Isaac and Jacob as his seed by giving them salvation covenants. The same thing is true for Adam, Abel and Seth.
But there is more. For if angelic salvation began with Seth than how was Abel born again? All covenant mediators must be either non adamic or born again for Jehovah is a God not of the dead but of the living (so every covenant mediator must possess at least one soul which is not under a death sentence!). Well, the answer lies in Abel's sacrifice being firstlings plural of the flock. He sacrificed for two covenants. The AFC and an angelic covenant. Let us call that the Abelian Angelic Covenant. But evidently Abel was killed before he was able to make that covenant with anybody and so God needed to appoint another seed underneath him, a submediator, in order to be able to save preflood people angelically. This seed was Seth. So really the SAC is a subcovenant of the Abelian Angelic Covenant which did not save anybody (other than Abel) and so does not count as one of the 24 salvation covenants since Abel actually did not mediate it to anyone. Adam was the mediator of the FBC and of the ABC. So there is no reason that Abel, his firstborn, could not have been the mediator of the both system covenants underneath Adam - see Intro28. So we see that Satan again attempted a salvation genocide on all mankind when he murdered Abel through his son Cain.
10 At this he said: What have you done? [There is a reader question!] Listen! Your brother's blood [sons of the AFC] is crying out to me from the ground [the true congregation of Adam's family].
11 And now you are cursed in banishment from the ground [this does not mean that he floated 10 feet in the air! It means that he was banned from the true congregation of Adam's covenant family, the sons of the AFC, Abel!], which has opened its mouth to receive your brother's blood [all those with faith, those in the earth of Adam, drink the blood of Abel, the mediator of the AFC. They drink the cup of the AFC. They did this on the night that Abel was killed. Cain was the original Caiaphas. Abel brought firstlings plural. Cain was a firstling. He was the high priest at the time he murdered Abel, being non adamic and free from death. He would have been so appointed once he reached 30 (the age when one could enter into temple service under law). This was the end of the law of Cain, the law of Caiaphas. They drank two cups at that Passover on 3928Nisan14, after which Cain murdered his brother. One of the Abelian Angelic Covenant and the other of the Abelian Faith Covenant] at your hand.
12 When you cultivate the ground, it will not give you back its power [your false religion will not have any divine backing. It will not result in any forgiveness or any salvation]. A wanderer and a fugitive you will become in the earth (Genesis 4 NWT).
3 From 30 years old upward to 50 years old, all those going into the service group to do the work in the tent of meeting (Numbers 4).
24 and Jesus the mediator of a new covenant, and the blood of sprinkling, which speaks in a better way than Abel's [blood]. (Hebrews 12 NWT)
For Abel had the blood of an old covenant, the first pre flood system covenant, the AFC. Cain got angry when he lost both his firstborn rights and his priesthood to Abel.
13 With that Jehovah God said to the woman: What is this you have done? To this the woman replied: The serpent -- it deceived me and so I ate.
14 And Jehovah God proceeded to say to the serpent: Because you have done this thing, you are the cursed one out of all the domestic animals and out of all the wild beasts of the field. Upon your belly you will go and dust is what you will eat all the days of your life.
15 And I shall put enmity between you and the woman and between your seed and her seed. He will bruise you in the head and you will bruise him in the heel.
16 To the woman he said: I shall greatly increase the pain of your pregnancy; in birth pangs you will bring forth children, and your craving will be for your husband, and he will dominate you. (Genesis 3 NWT)
So there shall be enmity between Eve and Satan. And between the seed of Eve and the seed of Satan i.e. Cain to start with. But wasn't Cain the seed of Eve?
1 Now Adam had intercourse with Eve his wife and she became pregnant. In time she gave birth to Cain and said: I have produced a man with the aid of Jehovah.
2 Later she again gave birth, to his brother Abel. And Abel came to be a herder of sheep, but Cain became a cultivator of the ground. (Genesis 4 NWT)
12 not like Cain, who originated with the wicked one and slaughtered his brother. And for the sake of what did he slaughter him? Because his own works were wicked, but those of his brother [were] righteous. (1 John 3 NWT)
Cain and Abel were not paternal brothers, so they must have been maternal brothers. So Cain was the seed of both the Serpent AND the woman!
Then Cain started a line of Satanic seed, in that his descendants were sons of Satan genetically.
17 Afterward Cain had intercourse with his wife and she became pregnant and gave birth to Enoch. Then he engaged in building a city and called the city's name by the name of his son Enoch.
18 Later there was born to Enoch Irad. And Irad became father to Mehujael, and Mehujael became father to Methushael, and Methushael became father to Lamech. (Genesis 4 NWT)
But this did not mean that they were all bad. No some sons of Satan would have joined the true church of Adam and some sons of Adam would have joined the false congregation of Cain. Now the physical, the genetic, prefigures the spiritual, the born again angelic seed. So there is enmity too between God's wife, the woman that Satan was the head of before he sinned, and Satan and between the seed of God's wife, the saints, the sons of the SAC (Sethian Angelic Covenant) and the sons of the DAC (Datanic Angelic Covenant). These are the weeds of the parable of the wheat and the weeds - see U70. So God has born again human children but so does Satan. However the sons of the DAC are all covenanted to go to Gehenna when they die whereas the sons of the ARC get everlasting life.
So the sons of the DAC have associated second dead Hell's angels. Whereas the sons of the ARC have associated everliving Michael's angels.