A top New York City rabbi has issued a chilling now-viral warning after Zohran Mamdani’s mayoral win: The pol’s positions on Israel may “severely threaten Jewish safety everywhere in the city.”

Rabbi Ammiel Hirsch delivered his blistering take on the radical extremist in a fiery sermon at his liberal Stephen Wise Free Synagogue on the Upper West Side on Friday.

Hirsch claimed Mamdani’s “opposition to Israel is existential.

“He believes that Israel has no right to exist at all — as a Jewish state in any territory,’’ the Manhattan rabbi said.

Hirsch, president of the New York Board of Rabbis, explained that he and other “prominent and liberal” rabbis went with “open hearts and open minds” to a one-hour meeting with the then-candidate in August.

He said they left horrified by his d

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