בראשית, פרק י״ז, פסוק י״ג

The commandment of circumcision establishes a profound, physical, and eternal bond between God and His people. This permanent seal of faith extends beyond the immediate family to include all members of the household, forging a unified spiritual identity. Abraham was required to circumcise his servants to ensure uniformity; a household could not maintain its integrity if divided by two opposing faiths, with some members bearing the mark of the covenant and others remaining uncircumcised [רד״ק]. The physical seal is placed specifically on the reproductive organ because the covenant inherently deals with the eternity of generations and the continuity of offspring [ספורנו]. Furthermore, the choice of an irremovable physical mark serves as a testament to the everlasting nature of the relationship. If the sign were external and removable, such as a special garment, one might mistakenly conclude that the covenant with God is only temporary [שד״ל, רבנו בחיי].

The Commandment encompasses various timelines and specific procedures. While standard circumcision occurs on the eighth day, the obligation extends to older household members and adult servants who were not circumcised as infants [שד״ל, העמק דבר, ביאור יש״ר]. Conversely, certain infants, such as a child born to a maidservant whose body does not belong to the master, are circumcised immediately on their first day of life [רש״י, מזרחי, גור אריה, שפתי חכמים, ברכת אשר]. The execution of the Commandment is a precise, two-step process involving the initial cut and the tearing of the inner skin [חזקוני, תורה תמימה]. It also requires the removal of any remaining skin that might invalidate the act, and the drawing of a drop of blood from a child born already circumcised [תורה תמימה]. Moreover, deliberately stretching the skin to conceal the circumcision is strictly forbidden, and anyone who alters their body in this way is obligated to undergo the procedure again [העמק דבר, תורה תמימה].

The identity and intent of the individual performing the procedure are also carefully defined. Only a person who is circumcised may circumcise others; a Jew who has deliberately chosen to break the covenant by remaining uncircumcised is disqualified from performing the act [מנחת שי, תורה תמימה, שפתי כהן, רא״ש]. Interestingly, the primary focus of the Commandment does not rest on the specific spiritual intent of the circumciser. Instead, the true essence lies in the physical reality established in the flesh of the circumcised individual and the father's deliberate intention to bring his child into the covenant [הכתב והקבלה].

Beyond its role as a physical sign, circumcision carries a profound dimension of sacrifice and atonement. It is compared to a ritual offering, yet it is considered even greater: while a standard sacrifice is purchased with money, circumcision is performed on a person's own body, making it as though the individual has offered himself to God. Just as an animal becomes eligible for a ritual offering only from its eighth day, this covenantal act is designated for the eighth day of life. The blood drawn serves as an atonement for sins and offers spiritual protection. According to tradition, Abraham performed his own circumcision on the Day of Atonement, and each year God looks upon the blood of this covenant to grant forgiveness to the Israelites [רבנו בחיי, צאינה וראינה].

Finally, the physical alteration carries a lasting impact on human nature. The procedure slightly weakens the physical organ, serving to moderate physical desire without compromising the ability to reproduce. The timing is carefully balanced; it is set for the eighth day because a newborn is initially too fragile, yet delaying the requirement until adulthood risks the Commandment being abandoned entirely. For Abraham, who was ninety-nine years old and physically frail, this act of devotion brought a miraculous promise. God assured him that specifically through fulfilling this physical covenant, he would be granted the renewed strength to father children and ultimately inherit the land of Israel [רבנו בחיי, צאינה וראינה].