בראשית, פרק ז׳, פסוק ד׳

As the cataclysmic flood approaches, God provides Noah with a precise schedule, the method of punishment, and the full scope of the impending destruction. A final grace period of seven days is granted before the waters fall. On a practical level, this defined window allows Noah the necessary time to finish gathering the animals and provisions into the Ark [רד״ק, קאסוטו]. Morally, this week serves as an extension of divine mercy, added to the one hundred and twenty years already given to that generation to repent [רש״י, גור אריה, משכיל לדוד]. The primary approach among commentators is that these seven days were specifically dedicated to mourning the righteous Methuselah. God spared his honor by delaying the disaster, ensuring humanity could properly eulogize him. Another perspective suggests that during this week, God drastically altered the laws of nature, such as making the sun rise in the west and set in the east, and even gave the generation a taste of the World to Come. These miracles were designed to show them exactly what they stood to lose, serving as one final plea for their repentance [הדר זקנים].

In bringing the floodwaters, God acts with an underlying sense of closeness and mercy, rather than distant strictness. This reveals that even within this severe decree of destruction, He is acting out of a deep concern for the future restoration of the world [רש״ר הירש]. The impending deluge consists of a relentless downpour falling from the heavens [קרני אור]. Although the bursting of the subterranean depths is not explicitly mentioned at this moment, the natural process dictates that heavy rainfall softens the dry earth, eventually causing underground springs to erupt to the surface. Through this dual assault of water, God effectively returns the world to its primordial state, just as it was at the dawn of creation when water covered the earth [רד״ק].

The specific duration of forty days and forty nights serves multiple purposes. First, defining a clear end to the storm is meant to reassure Noah, preventing him from falling into despair and thinking the rain will last forever [בכור שור]. Furthermore, the number forty represents a strict measure for measure consequence. Since forty days is the biological timeframe required for an embryo to take form, and the generation was rampant with forbidden relations that forced the Creator to form illicit offspring over forty days, their punishment mirrors this exact duration [רש״י, צאינה וראינה]. Other interpretations connect this timeframe to the forty lashes given as a corporal punishment, or to the fact that the generation violated the Torah, which was given over a period of forty days [חזקוני]. Practically speaking, even though the waters would remain on the earth for much longer, forty days of continuous torrential rain was the precise amount of time required to guarantee the eradication of all life [העמק דבר].

The target of this destruction encompasses all living creatures capable of standing upright on their feet [שד״ל, רלב״ג]. Naturally, this eradication applies exclusively to life on dry land, sparing the fish in the sea and the inhabitants of the Ark [רד״ק]. The act of blotting out life represents a complete dismantling of reality, standing in stark contrast to the very nature of existence, which symbolizes stability and standing firm. The tragedy is profound. God originally formed these creatures with the intention that they would live and stand independently. However, because they entirely corrupted their ways, He is tragically forced to undo and erase His own creation [רש״ר הירש].