Genesis 4:1

And the man knew Eve his wife; and she conceived and bare Cain, and said, I have gotten a man with the help of Jehovah.

"And the man knew Eve ..." is an expression used in the Bible for sexual intercourse, but it does not mean that this was the first such action on their part, for it is used repeatedly in the same sense, as in Genesis 4:25.

"I have gotten a man with (the help of) Jehovah ..." The italic words are not in the text, making possible an alternate rendition: "I have gotten a man, even the Lord,"[3] or, "I have gotten a man from the Lord."[4] Most scholars today deny that Eve's remark here has any reference to God's promise in Genesis 3:15, but their only reason for this lies embedded in one of their own petty rules, blinding them to the fact that a Great Deliverer is surely promised there. But Eve's mention here of her tragically mistaken view that Cain would be that Deliverer not only confirms the fact of the Deliverer's having been promised, but also the fact of Eve's having believed it. Kline and Ellison both discerned this: Eve's words were "a believing response,"[5] to Genesis 3:15, and, although Ellison designated this rendition as "improbable,"[6] he nevertheless admitted that it is possible. Our own conviction receives this unequivocally as Eve's believing response to the great Protoevangelium in Genesis 3:15. That she was tragically mistaken does not diminish the weight of this.