Prediction of ר' בחיי

Parshas Hashavua וירא The רבינו בחיי writes, (בראשית 21:14) "אברהם אבינו saw with his נבואה that his children the Bnei Yisrael will suffer in the future from ישמעאל. No other nation will hate the Bnei Yisrael more than ישמעאל. He therefore treated his son as an enemy and supplied him with bread & water, the way it says in Mishlei (25) אם רעב שונאך האכילהו לחם ואם צמא השקהו מים" Even though the Germans ימ"ש killed six million Yidden, however as much as they hated us, the ישמעאלים hate us even more. The Nazis weren't מוסר נפש in killing Yidden whereas ישמעאל will even commit suicide to Ch"v kill Yidden אמבצי