Was it Isaac or Ishmael that went with Abraham? The Muslim version has it that it was Ishmael, instead of Isaac according to Bible and Torah. Note the (*) in this hadith:
Muhammad b. al-Muntashir told of a man who vowed to sacrifice himself if God rescued him from his enemy.
He consulted Ibn ‘Abbas who told him to consult Masruq, and when he consulted him he replied, “Do not sacrifice yourself, for if you are a believer, you will kill a believing soul, and if you are an infidel you will hasten to hell; but buy a ram and sacrifice it for the poor, for Isaac was better than you and he was ransomed with a ram.” *
He told Ibn ‘Abbas and he replied, “This is the decision I wanted to give you.”
* This agrees with the story in the Old Testament which says that Abraham was preparing to sacrifice Isaac, whereas the usual Muslim version is that it was Ishmael.
Mishkat al-Masabih 3445
This is actually confirmed by the Koran with careful reading of Abraham’s saying:
37:99 And [then] he said, “Indeed, I will go to [where I am ordered by] my Lord; He will guide me. 100 My Lord, grant me [a child] from among the righteous.”
Koran 37:99-100
The phrase “from among the righteous” refers to Sarah, Abraham’s wife, the mother of the Jewish people, and thus the righteous. The son of Abraham and Sarah is Isaac.
37:101 So We gave him good tidings of a forbearing boy.
102 And when he reached with him [the age of] exertion, he said, “O my son, indeed I have seen in a dream that I [must] sacrifice you, so see what you think.”
He said, “O my father, do as you are commanded. You will find me, if Allāh wills, of the steadfast.”
103 And when they had both submitted and he put him down upon his forehead, 104 We called to him, “O Abraham, 105 You have fulfilled the vision.”
Indeed, We thus reward the doers of good.
106 Indeed, this was the clear trial.
107 And We ransomed him with a great sacrifice, 108 And We left for him [favorable mention] among later generations:
109 “Peace upon Abraham.”
Koran 37:101-109
As you can see, it’s a Muslim innovation to claim that Ishmael went with Abraham.
For more, see “Story of Isaac” and “Story of Ishmael“.
Koran Contradiction 