בראשית, פרק ט׳, פסוק ז׳

Emerging from the devastation of the Flood, humanity faces the monumental task of rebuilding a shattered world. A new covenant is established, serving as a bridge between the formation of societal laws and the practical mission of global restoration. While God commits to never again destroying the earth, humans are tasked with doing their part to renew the population [קאסוטו]. Although God already offered a blessing of fertility earlier, the primary approach among commentators is that the initial statement was a natural promise, whereas now it is formalized as a binding commandment [רש״י, רמב״ן, מזרחי, שפתי חכמים]. During their time in the Ark, the survivors were forbidden from engaging in marital relations. Upon leaving, this restriction was lifted, making intimacy permissible once more. Now, however, God elevates this natural act from a mere option to an active duty [אור החיים, גור אריה, ר׳ סעדיה גאון].

This mandate carries profound weight, with some commentators viewing it as a conditional agreement. God's oath to withhold future floods depends directly on humanity accepting the responsibility to bring new life into the world [אור החיים]. Interestingly, this obligation falls primarily upon men rather than women. Because the Torah is rooted in pleasantness and compassion, it recognizes that since the time of the first sin in Eden, childbirth carries inherent pain and physical danger. Consequently, women are not strictly commanded to risk their lives, even for the sake of repopulating the earth [משך חכמה].

The placement of this directive immediately following the severe prohibition against murder is highly deliberate. The close proximity teaches that failing to engage in procreation is spiritually equated to shedding blood, as both actions diminish the Divine image in the world and cause the Divine Presence to depart [רש״י, תורה תמימה, רבנו בחיי, מלבי״ם]. Furthermore, in the wake of such massive loss of life, the surviving humans might naturally hesitate to execute convicted murderers, fearing that doing so would further reduce their already tiny population. The directive directly addresses this anxiety by assuring society that they must not fear carrying out true justice. Executing a murderer will not deplete their numbers; on the contrary, the merit of upholding justice will ultimately cause the population to flourish [אלשיך, ספורנו, בכור שור, חזקוני].

Beyond the societal level, the command serves to alleviate the deep psychological fear of bringing children into a fragile, post-apocalyptic environment. Humans are urged not to let economic anxieties or emotional doubts prevent them from having children, but rather to trust that God provides the necessary blessings and strength to sustain new life [חומש קה״ת]. To emphasize the scale of this renewal, the instruction uses language typically associated with the animal kingdom, denoting rapid and massive reproduction [רד״ק, ביאור יש״ר]. However, this rapid growth is not meant to happen in a single location. Humanity is instructed to move quickly, scatter, and settle across the entire globe rather than remaining clustered together [העמק דבר, ר׳ סעדיה גאון].

This geographical dispersion is the very mechanism that drives population growth [העמק דבר]. Spreading across the earth exposes people to diverse climates, environments, and living conditions. This is a deliberate Divine design intended to foster profound physical, cultural, and intellectual diversity among humanity. Such variety compensates for human flaws, encourages continuous development, and ensures that the human race will never again face total collapse [רש״ר הירש]. Ultimately, the initial call to procreate focuses on the act of establishing families, while the concluding emphasis is entirely on the result: the immense numerical expansion required to breathe life back into the world [קאסוטו, רד״ק].