Michael Levy, whose brother, Or Levy, was kidnapped by Hamas from the Nova festival on Oct. 7, 2023, addressed the U.N. Security Council on Wednesday and told the global body to demand the release of the hostages.

“For 439 days, I’ve woken up every morning with a pit in my stomach, wondering where my brother is. Wondering if he’s cold. If he’s hungry. If he managed to survive another day,” Levy told the Security Council. “Every moment he remains in captivity is a moment of unbearable suffering for him and all of us who love him.”

The Hamas terror group didn’t only violate international law blatantly, he said, it is also committing “an assault on humanity itself.”

“Holding civilians hostage—men, women,...