Rabbi Yaakov Yitzchok Spiegel was the Ostrov-Kalushin Rebbe of Borough Park, N.Y., until his passing on March 23 due to complications from COVID-19.

Part of a rabbinic family for generations, his family was famously close with major Torah leaders of their day. Spiegel was also an expert in the laws of kashrut, certifying many well-known brands and products.

He leaves behind a brother, Rabbi Dovid Spiegel, who is the Ostrov-Kalushin Rebbe of Cedarhurst in Queens, N.Y.

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