Commentary for Berakhot 43:22
אמר ליה רב חסדא וכי יש טבילה בחמין אמר ליה רב אדא בר אהבה קאי כוותך
Rab Hisda asked him, "Is it then right to have immersion in warm water ?" He replied, "Rab Adda b. Ahabah is of the same opinion as thou."
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
That cold water is essential.
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