Commentary for Kiddushin 57:14
זירוז דכתיב (דברים ג, כח) וצו את יהושע וחזקהו ואמצהו מיד ולדורות דכתיב (במדבר טו, כג) מן היום אשר צוה ה' והלאה לדורותיכם:
How do we know that she [the mother] has no such obligation? - Because it is written, ['And Abraham circumcised his son.] as God had commanded him': 'him,' but not 'her' [the mother]. Now, we find this so at that time;<span class="x" onmousemove="('comment',' That Abraham, not Sarah, was commanded.');"><sup>23</sup></span> how do we know it for all times?<span class="x" onmousemove="('comment',' Lit., 'for generations'.');"><sup>24</sup></span>
Daf Shevui to Kiddushin
The idea that circumcision was a commandment not just for Abraham, but for all subsequent generations is derived from the use of the word “command.” We should note that Leviticus does state that newborn males must be circumcised on the eighth day. It is unclear why that source is not used here.
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