Reference for Niddah 111:55

בעי רבי ירמיה

— Come and hear what was taught: For how long must they be soaked in lukewarm water? Judah b. Nakosa replied, For twenty-four hours, being lukewarm at the beginning though not at the end. R. Simeon b. Gamaliel replied, They must be lukewarm throughout the twenty-four hours.

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