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There are many differences In Tanakh and Quran Narratives regarding Abraham’s sacrifice of his son. First of all Tanakh clearly states that the son was Issac as in Genesis 22:2. While in Quran the name of son is not mentioned and Muslims have disputed views on this although majority believe that he was Ismail (Ishmael). Among those who think he was Issac there are traditions from Umar, Abbas bin Abdul Muttalib, Abdullah bin Abbas, Abdullah bin Masud, Abu Hurairah, Qatadah and Ikrimah.
But if we carefully read the Tanakh we come to know that the son was Ishmael as there are many reasons for that first of all there are contradictions in Tanakh as in Genesis 22:2 it says that Isaac was the only son while at other places Tanakh mentioned that Isaac was not the only son.
Now Sarai, Abram’s wife, had borne him no children. But she had an Egyptian slave named Hagar; so she said to Abram, “The LORD has kept me from having children. Go, sleep with my slave; perhaps I can build a family through her.” Abram agreed to what Sarai said. So after Abram had been living in Canaan ten years, Sarai his wife took her Egyptian slave Hagar and gave her to her husband to be his wife. He slept with Hagar, and she conceived. When she knew she was pregnant, she began to despise her mistress. Genesis 16:1-4
The angel of the LORD also said to her: “You are now pregnant and you will give birth to a son. You shall name him Ishmael,for the LORD has heard of your misery. Genesis 16:11
Abram was eighty-six years old when Hagar bore him Ishmael. Genesis 16:16
God also said to Abraham, “As for Sarai your wife, you are no longer to call her Sarai; her name will be Sarah. I will bless her and will surely give you a son by her. I will bless her so that she will be the mother of nations; kings of peoples will come from her.” Abraham fell facedown; he laughed and said to himself, “Will a son be born to a man a hundred years old? Will Sarah bear a child at the age of ninety?” And Abraham said to God, “If only Ishmael might live under your blessing!” Then God said, “Yes, but your wife Sarah will bear you a son, and you will call him Isaac. I will establish my covenant with him as an everlasting covenant for his descendants after him. And as for Ishmael, I have heard you: I will surely bless him; I will make him fruitful and will greatly increase his numbers. He will be the father of twelve rulers, and I will make him into a great nation. But my covenant I will establish with Isaac, whom Sarah will bear to you by this time next year.” When he had finished speaking with Abraham, God went up from him. On that very day Abraham took his son Ishmael and all those born in his household or bought with his money, every male in his household, and circumcised them, as God told him. Abraham was ninety-nine years old when he was circumcised, and his son Ishmael was thirteen; Genesis 17:15-25
Abraham was a hundred years old when his son Isaac was born to him. Genesis 21:5
From all this above contradiction of Tanakh/Torah is clear as Ishmael born first and that time Abraham was of 86 years old than when Isaac born Abraham was of 100 years old. Thus till 14 years Ishmael was the only son of Abraham and if he was asked to sacrifice his only son than it must be of Ishmael and if it was Isaac than he should not be mentioned as only son…thus the contradiction.
For those Muslims who are of the view that the son was Isaac they should consider the other verses of Quran like Surah Hud 11:71 where God gave Abraham and his wife good news of Isaac; and after Isaac, Jacob. If the son was Issac then Abraham already knew that his son would live long enough to have Jacob as per the tidings already given.