Ultra-Orthodox Jews who believe the Internet threatens their way of life have rented the New York Mets' stadium for an unprecedented gathering on how to use modern technology in a religiously appropriate way.

More than 40,000 ultra-Orthodox Jewish men plan to pack Citi Field for Sunday's gathering on the dangers of the Internet, and organizers have rented nearby Arthur Ashe Stadium for the overflow crowd.

"It's going to be inspiration and education about using technology responsibly in accordance with Jewish values," said Eytan Kobre, a lawyer who is the spokesman for the event's organizers.

The rally is being organized by a rabbinical group called Ichud Hakehillos Letohar Hamachane, which means Union of Communities for the Purity of the Camp. Published reports have put the cost at $1.5 million.

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