Commentary for Chullin 19:23

עצם ודאי פוגם עור ספק פוגם ספק לא פוגם הוי ספק וודאי ואין ספק מוציא מידי ודאי

even though he was using that particular substance all day long [after his immersion], it is not regarded as a proper immersion unless he can declare: 'I am certain it was not upon me before [my immersion]' - Now in this case, he certainly immersed himself, and there is a doubt whether the substance was or was not upon him [before his immersion], yet the doubt sets aside the certainty! - This case is different, for one can say: Let the unclean person remain in his [unclean] status, and assume that there has been no immersion.

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