Alice C. Linsley
Susan Burns, a regular reader of Just Genesis and a fellow member of Open Anthropology Cooperative, has written an interesting and informative piece on Cain and Abel. She and I agree that the textual evidence suggests that Cain and Abel were twins. Here is what Susan has written:
"Genesis 4: Adam lay with his wife Eve, and she became pregnant and gave birth to Cain. She said, 'I have gotten a man with the help of YHWH'. She again bare his brother Abel. The Hebrew word used for again (yasaph) is an adverb meaning to continue to do a thing. Yasaph implies that Eve gave birth to Cain and continued to do the same thing by giving birth to Abel. In other words, Cain and Abel were twins. The profession of Abel was shepherd and Cain was a farmer and city builder."
The tradition of twins as the progenitors of tribal units or city builders is well documented in Semitic and Indo-European cultures. Usually the first born ascends to the throne of his ruler father and the younger is sent away to establish a territory of his own. In the Bible most of the heroes are sent away sons: Cain the first ruler and city builder named in Genesis, Abraham the youngest son of Terah, Moses the youngest son of Amram, and David the youngest son of Jesse. There is also Joseph who was sent away by his envious brothers who sold him into slavery.
There are many variations on the theme of rivalry between twins. Jacob is fearful that Esau will kill him for attempting to steal his birthright. In Egyptian mythology Geb (earth) and Nut (sky) were twins. Romulus killed Remus, and in Celtic legend Gwyn and Gwythurin duel every May.The Gemini twins, Castor and Pollux, shared a mortal and an immortal existence. Castor was killed on a cattle raid but Pollux persuaded Zeus to allow the brothers to switch places periodically. In Arabian mythology Pollux and Castor were regarded as twin peacocks.
It may be that Peleg and Joktan were twins, but the following wording does not carry the same suggestion as with Cain and Abel. "To Eber were born two sons: the first was called Peleg, because it was in his time that the earth was divided, and his brother was called Joktan. (Gen. 10:25)
Related reading: Sent Away Sons; Noah's Sons and Their Descendants; The Marriage and Ascendancy Pattern of Abraham's People; From Cain to Jesus Christ; Cain's Murder of Abel