Cops arrested a Brooklyn man Monday who allegedly stabbed a Jewish worshipper leaving synagogue after the attacker boasted about wanting to “kill a Jew.”

Following a nearly week-long manhunt, Armani Charles, 23, was cuffed on hate crime charges for allegedly knifing 35-year-old Elias Rosner in the chest outside a Lubavitch Hasidic temple in Crown Heights on Dec. 16.

Rosner told The Post that he overheard Charles ranting about how he was “going to kill a Jew today” while spewing various antisemitic slurs — and brandishing a knife.

“I’m going to kill Jewish people, I’m going to kill a Jew today, I don’t give a f–k … We wouldn’t be in this mess if the Holocaust had happened,” the unhinged man ranted, according to Rosner.

“I was waiting in a crowd of Jewish people and this guy started spouting stuff,” Rosner recalled.

The victim said he believes “in standing up to bullies” and was the only one who “had the bravery to look him in the eye.”

When he did, Charles allegedly pounced on Rosner and stabbed him once in the chest — just centimeters away from his heart — at the corner of Kingston Avenue and Lincoln Place.

The Jewish Brooklynite said he’s trained in martial arts and was more than prepared to handle the antisemite – even after narrowly dodging a would-be fatal injury.

Despite his bleeding wound, he continued to chase his assailant down the street for another block until he couldn’t keep up, according to surveillance footage shared by the NYPD. 

Rosner was treated at Kings County Hospital and released a day after the attack.

After his release, he told The Post he used his sweater as a makeshift “sarong” to catch the blade and soften the blow — likely saving his own life.

“I was able to catch most of the force of the blade with the sweater and that’s basically what saved my life,” he said.

Charles was charged with attempted assault, assault, aggravated harassment and menacing, all as a hate crime, police said.

In the wake of the attack, which took place on the third night of Hanukkah, the NYPD added “dozens of additional officers” in Crown Heights – a historically Jewish neighborhood.

Rosner said the flagrant attack that nearly claimed his life was a ripple effect of the steady uptick in antisemitic sentiment ever since the start of the Israel-Hamas War in October 2022.

This year, roughly 305 of the 550 total hate crimes reported to the NYPD explicitly targeted Jewish residents or property, according to statistics from the NYPD. It’s a close match with last year’s stats, which saw 334 of 646 bias incidents labeled as antisemitic.