It goes back to basic Islamic theology:

Islam considers Ishmael to be Abraham's favoured son and the patriarch of Arab tribes. 

Islam holds that the Jews (Isaac's descendants) corrupted the scriptures and turned the world against Allah, and disrespected Allah by making the "Prophet" Jesus equal with God. Therefore, they are "agents of Satan" who good Muslims have the duty to resist till the end of time. When their Messiah (Mahdi) will return and vanquish the Jews and the Christians they created.

In Islamic Eschatology, the Dajjal (Antichrist) is literally a Jewish King, and the battle between the Mahdi and Dajjal won't occur until Israel and the Jews are destroyed.