Reference for Shabbat 273:15
תני ר' חייא אומר היה ר"מ לא נחלקו רבי אלעזר ורבי יהושע על מי שהיו לו ב' תינוקות א' למול בע"ש וא' למול בשבת ושכח ומל את של ע"ש בשבת שהוא חייב
The School of R. Jannai said: The first clause is, e.g., where the [infant] belonging to the Sabbath was previously circumcised on the eve of the Sabbath, so that the Sabbath does not stand to be superseded;<span class="x" onmousemove="('comment',' There is no infant left for whom the Sabbath must be violated. There was therefore no preoccupation with a precept and the error consequently was inexcusable, hence he is culpable. ');"><sup>14</sup></span>
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