John Gills Exposition of the Bible Commentary - Genesis 4:1
And Adam knew Eve his wife ,.... 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... read more
Matthew Henry's Complete Commentary - Genesis 4:1-2
Adam and Eve had many sons and daughters, Gen. 5:4. But Cain and Abel seem to have been the two eldest. Some think they were twins, and, as Esau and Jacob, the elder hated and the younger loved. Though God had cast our first parents out of paradise, he did not write them childless; but, to show that he had other blessings in store for them, he preserved to them the benefit of that first blessing of increase. Though they were sinners, nay, though they felt the humiliation and sorrow of... read more