Reference for Chullin 210:4
אמר רב יצחק בר יוסף אמר רבי ינאי
They said this only of [hot] water wherein the hand is scalded, but one may wash the hands with water wherein the hand is not scalded.
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אמר רב יצחק בר יוסף אמר רבי ינאי
They said this only of [hot] water wherein the hand is scalded, but one may wash the hands with water wherein the hand is not scalded.