Commentary for Avodah Zarah 82:10
ואין ספק מוציא מידי ודאי והתניא חבר שמת והניח מגורה מלאה פירות אפילו הן בני יומן הרי הן בחזקת מתוקנין
And a doubt does not set aside a certainty? Behold it has been taught: If a haver died and left a store-room full of produce even if they were only picked that day, they are presumed to have been properly tithed.
Daf Shevui to Avodah Zarah
A haver is someone known to tithe his food. This haver dies leaving a store room full of produce, and we do not know whether it has been tithed or not. The produce was certainly untithed at one point (this would be true of all produce). But now the “doubt” about whether it was tithed seems to be significant enough to presume that the produce is tithed. Thus a doubt sets aside a certainty.
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