A millennium-old Jewish practice that warns against water consumption during specific calendar transitions continues to spark debate among contemporary religious authorities.
The Hebrew calendar divides the year into four seasonal periods – Tishrei, Tevet, Nisan, and Tammuz. During the transitions between these seasons, some communities traditionally abstain from drinking water, believing it could pose serious health risks.
The practice's origins trace to the Geonic period over a thousand years ago, documented in Responsa literature that offers two primary explanations: the changeover of guardian angels between seasons, and a symbolic avoidance of beginning new periods with water, considered an elemental substance.
Rabbi David Stav, chairman of the Tzohar Rabbinical Organization, points to several factors that have diminished the custom's observance in modern times. "The Yaavetz [Rabbi Yaakov Emden] established that customs absent from the Talmud carry no binding obligation. Additionally, modern plumbing systems, which use iron pipes, may nullify the original concerns."
Contemporary religious authorities remain divided along traditional lines. While Ashkenazi leaders like Rabbi Chaim Kanievsky noted the custom's absence in prominent households such as that of the Chazon Ish, significant Sephardic authorities maintain its relevance.
Rabbi Ovadia Yosef advocated continuing the practice, recommending abstention from water thirty minutes before and after seasonal transitions. His position reflects broader Sephardic adherence to the custom, which persists in communities from Jerusalem to Tunisia.
The debate extends beyond mere tradition. Rabbi Meir Mazuz, citing his father Rabbi Matzliach Mazuz, suggests modern health issues might stem from disregarding this practice. Meanwhile, Kabbalist Rabbi Yitzchak Basri emphasizes its mystical significance, referencing the Zohar's teaching about heightened divine judgment during these transitions.
