Rabbi Yosef Shalom Elyashiv was hospitalized Wednesday night at Sha'arei Hesed Hospital in Jerusalem with symptoms of pneumonia.
The nonagenarian rabbi, considered to be the greatest living authority of halacha, was suffering from a high fever and a cough.
Leaders of the haredi community called on the public to pray for the rabbi whose mother's name was Chaya Musha.
According to Jewish custom a sick person's name followed his or her mother's name is included in prayers for the person's recovery.
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