Prominent ultra-Orthodox Rabbi Yosef Shalom Elyashiv’s health took a turn for the worse on Tuesday after doctors at the Shaare Zedek Medical Center discovered severe blood poisoning.

Doctors worked to stabilize the 102-year-old rabbi, whom they said was in critical condition.

The rabbi’s family was called to the Jerusalem hospital on Tuesday morning because of his deteriorating condition. They asked the public to pray on his behalf.

Rabbi Elyashiv has been hospitalized since February. He is considered one the senior rabbis of the Lithuanian ultra-Orthodox community.