Commentary for Kiddushin 57:12
איהי מנלן דלא מיחייבא דכתיב (בראשית כא, ד) כאשר צוה אותו אלהים אותו ולא אותה
Some say, to teach him to swim too, R'Judah said: He who does not teach his son a craft, teaches him brigandage, 'Brigandage'! can you really think so! - But it is as though he taught him brigandage.<span class="x" onmousemove="('comment',' Having no occupation, he must take to theft.');"><sup>18</sup></span> 'To circumcise him.' How do we know it? - Because it is written: And Abraham circumcised his son Isaac.<span class="x" onmousemove="('comment',' Gen. XXI, 4.');"><sup>19</sup></span>
Tosafot on Kiddushin
Him and not her- If you will say why do we need the passuk? For time bound mitzvoth we know women are exempt. From the eighth day on its a mitzvah until you do it. Since its a mitzvah can we do it during the day or at night? From the eighth day on if you haven't done it yet you can do it at night
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Daf Shevui to Kiddushin
God commanded Abraham to circumcise Yitzchak. He did not command Sarah.
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