Reference for Keritot 13:50

לא אם אמרת בחטאת ואשם שאין מכפרין על המזיד כשוגג תאמר ביוה"כ שמכפר על המזיד כשוגג

but if one did not afflict himself or did work on it or did not call it a holy convocation, I might think that the Day of Atonement does not atone for him; therefore it is stated: It is the Day of Atonement:<span class="x" onmousemove="('comment',' Lev. XXIII, 27. The article is considered superfluous and is understood as an amplification.');">³¹</span>

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