Reference for Yoma 161:16

איכא למיפרך מה לעינוי שלא הותר מכללו תאמר במלאכה שהותרה מכללה

i.e., one is warned concerning the day itself but not concerning [work done] during the additional time. One might have assumed that one is not under a warning concerning labour performed during the additional time, but one is under a warning concerning [failure of] affliction during the additional time; but a logical inference cancels that.

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