Reference for Moed Katan 17:9

מאי דרוש אמרו קל וחומר ומה משכן שאין קדושתו קדושת עולם וקרבן יחיד דוחה שבת דאיסור סקילה מקדש דקדושתו קדושת עולם וקרבן צבור ויום הכפורים דענוש כרת לא כ"ש

R'Parnak, reporting R'Johanan, said that that year Israel did not observe the Day of Atonement, whereat they were perturbed, saying, that perhaps the enemies of Israel<span class="x" onmousemove="('comment',' A euphemistic expression for 'Israel'.');">¹¹</span> had thereby incurred their doom;<span class="x" onmousemove="('comment',' Lev. XXIII, 29-30, threatens the non-observance of the Day of Atonement. by working and eating with the penalty of kareth.');">¹²</span>

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