Reference for Shevuot 9:8

אמר מר ונעלם מכלל שידע מאי משמע אמר רבא מדלא כתיב והיא עלומה ממנו

If so why does Scripture say: it was hidden from him - twice: - In order to make him liable both in the case of forgetfulness of the uncleanness, and in the case of forgetfulness of the Temple or holy food.' The Master said: 'And it was hidden from him, therefore it must have been known to him'.

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