Alice C. Linsley
When I was in seminary, my Old Testament professor told the class that he doubted Isaac’s existence because there is so little information about Isaac. He noted that the story of Isaac pretending that Rebekah was his sister parallels the story of Abraham asking Sarah to say that she is his sister. He concluded that Isaac is a literary construction reflecting the author’s love of narrative doublets, duplicates of the same event believed by critics to be told by two different sources.
While I appreciate this professor’s observations, I disagree with his conclusion. Isaac’s historicity can be verified by analysis of the Hebrew kinship pattern. Kinship patterns as complex as that of the early Hebrew are not found with fictional characters. Further, the kinship pattern of Abraham's people reveals a good deal of information about the principal figures of Genesis.
When I was in seminary, my Old Testament professor told the class that he doubted Isaac’s existence because there is so little information about Isaac. He noted that the story of Isaac pretending that Rebekah was his sister parallels the story of Abraham asking Sarah to say that she is his sister. He concluded that Isaac is a literary construction reflecting the author’s love of narrative doublets, duplicates of the same event believed by critics to be told by two different sources.
While I appreciate this professor’s observations, I disagree with his conclusion. Isaac’s historicity can be verified by analysis of the Hebrew kinship pattern. Kinship patterns as complex as that of the early Hebrew are not found with fictional characters. Further, the kinship pattern of Abraham's people reveals a good deal of information about the principal figures of Genesis.
According to the marriage and ascendancy pattern of the early Hebrew, Isaac was Abraham's proper heir because he was the firstborn (only) son of Abraham's principal wife, his half-sister bride, Sarah. When Abraham died, Isaac became the ruler over Abraham's territory which extended on a north-south axis between Hebron and Beersheba (shown on this map).
After the binding of Isaac, Abraham and Isaac were living in Beersheba, and it was to the region of Beersheba in the Negev (Gen. 24:62) that Abraham’s servant brought Rebekah to meet her betrothed.
Beersheba was the settlement of Abraham’s cousin wife, Keturah. Isaac probably had already married his first wife, a half-sister. That wife was a daughter of Abraham and Keturah. By his first wife Isaac had sons and daughters who became the marriage partners of the sons and daughters born to Isaac by Rebekah. All of these persons were Hebrew and the Hebrew were a ruler-priest caste that practiced endogamy.
The kinship pattern of the early Hebrew provides the essential information to draw this conclusion and to justify it on the basis of the text alone.
It is possible to trace some of Isaac's children by his first wife through the cousin bride’s naming prerogative. Rebekah’s father was Bethuel (Gen. 22:23), a son of Nahor, Abraham’s brother. Why didn’t she name her firstborn son Bethuel after her father? This is the pattern for those who were to rule. We are given this explanation: Jacob grasped his twin brother’s heel as he was born (Gen. 25:26) “so his name was called Jacob.” It is also possible that Rebecca didn’t name her first-born son after Bethuel because this son was not the one who would rule after Isaac’s death. Isaac's proper heir according to the Hebrew marriage and ascendancy pattern was Esau.
The kinship pattern of the early Hebrew provides the essential information to draw this conclusion and to justify it on the basis of the text alone.
It is possible to trace some of Isaac's children by his first wife through the cousin bride’s naming prerogative. Rebekah’s father was Bethuel (Gen. 22:23), a son of Nahor, Abraham’s brother. Why didn’t she name her firstborn son Bethuel after her father? This is the pattern for those who were to rule. We are given this explanation: Jacob grasped his twin brother’s heel as he was born (Gen. 25:26) “so his name was called Jacob.” It is also possible that Rebecca didn’t name her first-born son after Bethuel because this son was not the one who would rule after Isaac’s death. Isaac's proper heir according to the Hebrew marriage and ascendancy pattern was Esau.
Rebecca is central to Isaac’s claim as the heir to Abraham’s territory and to the divine promises, yet she did not name her firstborn son after her father, as was the practice for the sons of cousin brides who were to be rulers in the territories of their maternal grandfathers. This suggests that Isaac had another firstborn son by another wife. His proper heir was the firstborn son of his first wife, a daughter of Keturah.
Tracking Firstborn Sons
How do we track Isaac’s first-born by his other wife? We must look for the hidden third son, which involves looking for linguistic similarity as in the case of Og, Magog and Gog. When we do this, we find three sons of Abraham: Yitzak (Isaac) by Sarah; Yishmael (Ishmael) by Hagar, and Yishbak (Ishbak) by Keturah. We note the parallel names and Yitz and Yish, which recall the 3-son confederations of the ancient Kushite rulers.
Yishbak the elder would have had a grandson name Yishbak. This younger Yishbak is the first-born of Isaac by a daughter of Yishbak. She named their first-born son Yishbak after her father, according to the naming prerogative of the cousin bride.
How do we track Isaac’s first-born by his other wife? We must look for the hidden third son, which involves looking for linguistic similarity as in the case of Og, Magog and Gog. When we do this, we find three sons of Abraham: Yitzak (Isaac) by Sarah; Yishmael (Ishmael) by Hagar, and Yishbak (Ishbak) by Keturah. We note the parallel names and Yitz and Yish, which recall the 3-son confederations of the ancient Kushite rulers.
Yishbak the elder would have had a grandson name Yishbak. This younger Yishbak is the first-born of Isaac by a daughter of Yishbak. She named their first-born son Yishbak after her father, according to the naming prerogative of the cousin bride.
Yishbak’s name means he will leave, indicating that he was a sent-away son. He is likely one of the sons to whom Abraham gave gifts before sending them away to the east (Gen. 25:6). Yishbak’s descendants lived in the lands to the east of Canaan. Assyriologist Friedrich Delitzsch identified the name Ishbak with Iasbuk found on cuneiform inscriptions from a land whose king was allied with Sangara of Gargamis (Carchemish) against Assur-nazir-pal and Shalmaneser II (c. 859 B.C.). This Ishbak or Yisbak was likely a descendant of Abraham and Isaac.
It is fairly safe to conclude that Isaac had at least three sons and their names were: Jacob, Esau and Yishbak, the last being named by the cousin bride after her father, according to the cousin bride's naming prerogative. All three appear to have been rulers over their own territories.
Related reading: The Hebrew Hierarchy of Sons; The Hebrew Were a Caste; Terah's Two Wives; Moses' Two Wives; Three-Clan Confederations of the Bible; Hebrew Rulers with Two Wives
NOTE
This pattern is like that of the Kushite rulers. The Kushite ruler Piye united Nubia and Egypt and established the 25th Dynasty. Before his death, Piye divided his kingdom between his 3 first-born sons, whose names are linguistically similar. Sheba-qo ruled in Thebes, Shebit-qo ruled in Napata, and Ta-har-qo ruled in Memphis. Shebaqo revived the office of high priest, which he awarded to his son Hori-makhet who was high priest in Thebes.