Laughable … Ishmael was cast out by Abraham, the father / patriarch of the Jews / Jewish People
He was cast out along with his mother Hagar, a slave in Abraham’s household … since Sarah was Abraham’s wife and she was jealous
That’s the story in the Holy Bible / Torah / 5 Books of Moses / Old Testament / Ta’nach … THAT’S the source of the story
God / Elohim / the Holy One asked Abraham to sacrifice his son by Sarah and Abraham was willing but God was testing Abraham and he pulled through … so a Ram was provided as an offering and Isaac was spared … Isaac not Ishmael was to be sacrificed … hello?
Get it?
The Jewish Holy Book was the source of the story … full stop
Ya feel me?