Genesis 4:1

“And Adam knew Eve his wife, etc.] An euphemism, or modest expression of the act of coition. Jarchi interprets it, “had known”, even before he sinned, and was drove out of the garden; and so other Jewish writers, who think he otherwise would not have observed the command, “be fruitful and multiply”: but if Adam had begotten children in a state of innocence, they would have been free from sin, and not tainted with the corruption of nature after contracted; but others more probably think it was some considerable time after; according to Mer Thudiusi, or Theodosius f242, it was thirty years after he was driven out of paradise: and she conceived and bare Cain; in the ordinary way and manner, as…”

“BIRTH OF CAIN AND ABEL. (Gen. 4:1-26) Eve said, I have gotten a man from the Lord--that is, "by the help of the Lord"--an expression of pious gratitude--and she called him Cain, that is, "a possession," as if valued above everything else; while the arrival of another son reminding Eve of the misery she had entailed on her offspring, led to the name Abel, that is, either weakness, vanity (Psa 39:5), or grief, lamentation. Cain and Abel were probably twins; and it is thought that, at this early period, children were born in pairs (Gen 5:4) [CALVIN].”

“- Section IV - The Family of Adam - Cain and Abel 1. קין qayı̂n, Qain (Cain), “spear-shaft,” and קנה qānah, “set up, establish, gain, buy,” contain the biliteral root קן qan, “set up, erect, gain.” The relations of root words are not confined to the narrow rules of our common etymology, but really extend to such instinctive usages as the unlettered speaker will invent or employ. A full examination of the Hebrew tongue leads to the conclusion that a biliteral root lies at the base of many of those triliterals that consist of two firm consonants and a third weaker one varying in itself and its position. Thus, יטב yāṭab and טיב ṭôb. So קין qayı̂n and קנה qānah grow from one root. 2. הבל…”

“Adam and Eve had many sons and daughters, Gen 5:4. But Cain and Abel seem to have been the two eldest. Cain signifies possession; for Eve when she bare him said with joy and thankfulness, and great expectation, I have gotten a man from the Lord. Genesis 4:2”

“4:1 had sexual relations (literally knew): In certain contexts, the Hebrew term meaning “to know” is an idiom for sexual knowledge of another person (4:17; 19:33, 35). It is never used of animals, which mate by instinct. • With the Lord’s help:: Eve fulfilled her God-given role of procreation despite the negative effects of the Fall (see 3:16, 20). • I have produced: Cain (Hebrew qayin) sounds like a Hebrew term (qanah) that can mean “produce” or “acquire.””

“knew: Num 31:17 Cain: That is, gotten or acquired. I have: Gen 4:25, Gen 3:15, Gen 5:29; Jo1 3:12 Genesis 4:2”

“The propagation of the human race did not commence till after the expulsion from paradise. Generation in man is an act of personal free-will, not a blind impulse of nature, and rests upon a moral self-determination. It flows from the divine institution of marriage, and is therefore knowing ( ) the wife. - At the birth of the first son Eve exclaimed with joy, "I have gotten ( ) a man with Jehovah;" wherefore the child received the name Cain ( from = , κτα σθαι). So far as the grammar is concerned, the expression might be rendered, as in apposition to , "a man, the Lord" (Luther), but the sense would not allow it. For even if we could suppose the faith…”