While this quote may not have come from him, he was 'known' for anti-semetic comments and viewpoints. He said all the wars are because of the jews. From what I remember, it was based on the time he was arrested drunk and also because he claimed the Jews killed Jesus for his movie The Passion of the Christ. He's a big Catholic and I believe his dad too who was known for same beliefs and rejects the Vatican/Pope. He apologized, who knows if forced, to the jewish community too. Please do a little work and just plug in a search before claiming there is no sauce, because there is plenty and this was a whole ordeal back in the day and why Gibson was blacklisted from Hollywood for a long time and credits Robert Downey Jr to getting him back on track.

News segment about the arrest : https://www.youtube.com/watch?v=-I9NTnvRSWQ

Some examples : https://forward.com/culture/449521/mel-gibson-anti-semitism-timeline-winona-ryder/

Apology: https://www.adl.org/resources/letter/mel-gibsons-apology-jewish-community

Mel Gibson Accounts for his Drunken Anti-Semitic Tirade (Part 1 of 2) : https://www.youtube.com/watch?v=SeQMMp4tXfk

Israel's Chief rabbi demanding the Catholic church to acknowledge jews did not kill Jesus and to condemn the Passion movie: https://www.youtube.com/watch?v=ojkGbbxf36o

Bonus : Here is a full interview of him talking about the weirdness of Hollywood too.

https://www.youtube.com/watch?v=qiXhwkg6ikI