Genesis 4
4 And Abel, he also brought of the firstlings of his flock and of the fat thereof. And the Lord had respect unto Abel and to his offering:
5 But unto Cain and to his offering he had not respect. And Cain was very wroth, and his countenance fell.
6 And the Lord said unto Cain, Why art thou wroth? and why is thy countenance fallen?
7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.
8 And Cain talked with Abel his brother: and it came to pass, when they were in the field, that Cain rose up against Abel his brother, and slew him.
9 And the Lord said unto Cain, Where is Abel thy brother? And he said, I know not: Am I my brother's keeper?
10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.
11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;
Clearly it is explained how both brothers brought sacrifice to the Lord.
Cains was not accepted as his heart was not right
7 If thou doest well, shalt thou not be accepted? and if thou doest not well, sin lieth at the door. And unto thee shall be his desire, and thou shalt rule over him.
10 And he said, What hast thou done? the voice of thy brother's blood crieth unto me from the ground.
11 And now art thou cursed from the earth, which hath opened her mouth to receive thy brother's blood from thy hand;
If he was the son of the serpent why would he bring sacrifice to the Lord?
Cain was cursed after he slew his brother.
Quoting: M1.618 qayin
kah'-yin
The same as H7013 (with a play upon the affinity to H7069); Kajin,
the name of the first child, also of a place in Palestine, and of an Oriental tribe: - Cain, Kenite (-s).
Total KJV occurrences: 19
hebel
heh'-bel
The same as H1892; Hebel,
the son of Adam: - Abel.
Total KJV occurrences: 8
I find it interesting that Cain is not referred to as the first son of Adam. But Abel is duly noted as the son of Adam.
I suppose you think nothing of it though.
Cain was born into sin. Abel was of pure seed.
Cain did not bring his best to God but Abel did. Cain slew his brother because he had a special little something inside him. The devil inside. How did the thought of murder enter into Cain's mind? It's because his father was a liar from the beginning.
The thought of killing his own brother did not even occur to Abel as it was not in him to murder.
Cain, being a half breed, still had potential to overcome his inherent sinfulness. He failed and God was not impressed with his sacrifice.
