John Gills Exposition of the Bible Commentary - Genesis 4:2
And she again bare his brother Abel ,.... Or "added to bare" F25 ותסף ללדת "et addidit ut pareret", Pagninus, Montanus; "addidit autem parere", Cocceius, Schmidt. , not directly or immediately, but perhaps the following year; though some have thought, because no mention is made of her conceiving again, that she brought forth Abel at the same time she did Cain, or that the birth of the one immediately followed upon that of the other: and it is the common opinion of the Jews F26 ... 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