Commentary for Berakhot 49:18
א"ר יוסף שרא ליה מריה לגניבא השתא צואה אמר רב יהודה אמר רב כיון שקרמו פניה מותר מי רגלים מיבעיא
Rab Judah [Rab Josef] said : May his teacher forgive Geniba; since in the case of excrement Rab Judah said in the name of Rab : When the surface has hardened it is permitted [to read the Shema' thereby], how much more so with urine !
Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
Geniba had wrongly reported the teaching of Rab.
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Abraham Cohen Footnotes to the English Translation of Masechet Berakhot
That Rab permits the Shema' when the moisture had dried, and not when all trace had disappeared, as Geniba reported him.
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