Reference for Shevuot 7:13

אלא רבי טעמיה דנפשיה מפרש דתניא מנין שאינו חייב אלא על שיש בה ידיעה בתחלה וידיעה בסוף והעלם בינתים ת"ל (ויקרא ה, ב) ונעלם ונעלם שני פעמים דברי ר"ע

For it is taught: Whence do we deduce that one is not liable [to bring a sacrifice] except when there is knowledge at the beginning and at the end and forgetfulness between? Scripture records: It was hidden from him - twice.<span class="x" onmousemove="('comment',' Lev V, 2, 3. One being superfluous, it is to teach that the uncleanness was hidden from him after having been known to him (i.e., knowledge at the beginning) ; knowledge at the end is obviously necessary, otherwise how does he know to bring a sacrifice? (Tosaf) .');">¹⁵</span>

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