When the volume of urine present is less than a revi'it, is a full revi'it of water still required, or does a smaller amount of water suffice?
Synopsis
When urine volume is less than a revi'it, there is a dispute whether the full revi'it of water is still required, or whether a majority (rov) suffices, or just the volume equal to the urine. The Mishnah Berurah records the Chacham Tzvi's leniency and notes later authorities' agreement.
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