Reference for Shabbat 273:17

השתא רבי יהושע סיפא דלא קא עביד מצוה פוטר רישא דקא עביד מצוה מחייב

<b><i>MISHNAH</i></b>. AN INFANT IS TO BE CIRCUMCISED ON THE EIGHTH, NINTH, TENTH, ELEVENTH, AND TWELFTH [DAYS], NEITHER EARLIER NOR LATER. HOW SO? IN THE NORMAL COURSE, IT IS ON THE EIGHTH; IF HE IS BORN AT TWILIGHT, ON THE NINTH;<span class="x" onmousemove="('comment',' As it may have been night already, and circumcision must not take place before the eighth. ');">¹⁵</span>

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