Reference for Shabbat 273:9

ושניהם לא למדוה אלא מעבודת כוכבים ר' אליעזר סבר כעבודת כוכבים מה עבודת כוכבים אמר רחמנא לא תעביד וכי עביד מיחייב ה"נ לא שנא

BUT R. JOSHUA EXEMPTS [HIM].<span class="x" onmousemove="('comment',' He erred through the fulfilment of a precept, viz., because he was occupied with the circumcision of the second, which actually was to be done that day; he also did fulfil a precept by circumcising the first, and R. Joshua holds that in such a case one is not culpable. ');">⁹</span>

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