Coffman Commentaries on the Bible - Genesis 4:2
And again she bare his brother Abel. And Abel was a keeper of sheep, but Cain was a tiller of the ground.The speculation has long prevailed that Cain and Abel were twins, based on the omission of a second statement that Adam knew his wife. This may "very well be the meaning,"[7] but it should not be pressed. Also, it appears that the names of these two brothers were "bestowed by the mother,"[8] which is another hint of the matriarchate, when a man left his father and mother and went to live... read more
E.W. Bullinger's Companion Bible Notes - Genesis 4:2
Abel = = transitoriness. read more