בראשית, פרק י״ז, פסוק י״ד

Avoiding the Commandment of circumcision is not merely a localized failure to act; it represents a profound disconnection from the divine destiny and tradition of the people. To define the exact nature of this physical mark, the requirement specifically targets the organ that distinguishes a male from a female [רש״י, מזרחי, גור אריה, מחוקקי יהודה]. Furthermore, the physical flesh must be literally cut away. This ensures the act is understood as a concrete physical reality, contrasting with metaphorical expressions found elsewhere, such as an uncircumcised heart or lips [רמב״ן].

While the initial responsibility to perform this act rests with the father, the ultimate burden falls upon the individual himself once he reaches adulthood. The primary approach among commentators is that if a father fails to circumcise his son, the father neglects a positive Commandment but does not incur the ultimate penalty. Instead, the severe consequence is reserved exclusively for the grown man who consciously continues to neglect this duty [אבן עזרא, רד״ק, רש״י, מלבי״ם, ביאור יש״ר].

The penalty for this lifelong refusal is being entirely cut off from the people, a concept understood across physical, social, and spiritual dimensions. On a physical level, this means premature death at the hands of Heaven, generally before the age of fifty or sixty. It also includes dying childless, as leaving behind offspring is viewed as the natural continuation of a person's life in this world [רש״י, רד״ק, שד״ל, מזרחי, לבוש האורה]. Socially, the uncircumcised individual is severed from the community of God's servants, lacking the physical seal that testifies to his belonging [בכור שור]. Spiritually, the punishment extends beyond the grave. The soul is distanced from the source of life, ultimately losing its future and its share in the World to Come [ביאור יש״ר, שטיינזלץ, אם למקרא, רש״ר הירש].

The severity of this punishment stems from the fact that failing to circumcise is not viewed as mere passivity. Rather, it is a deliberate nullification of the covenant forged between God and Abraham. By remaining uncircumcised, a person actively declares that he is removing himself from God's guidance and the destiny of his people [רד״ק, מלבי״ם, רש״ר הירש]. Taking this idea of active rebellion even further, some commentators apply this severe consequence to a man who was properly circumcised but later artificially stretched his skin to appear uncircumcised. Through this physical alteration, he literally and contemptuously breaks the covenant with his own body [העמק דבר, תורה תמימה, קיצור בעל הטורים].