it goes back to Abraham and the belief that Ishmael was cheated of his inheritance by Isaac.
Which is between the ARABS and the Jews, not the muslims and the Jews. The Jews came from Isaac, and the arabs from Ishmael. People get muslims and arabs mixed up all the time - the Jews and arabs (and Christians) have the same God, the God of Abraham. The muslims' god is the pagan god, allah, the moon god. So, when people say the muslims have the same God as the Jews, they're dead wrong! They do not!