איוב, פרק ל״ח, פסוק י׳

God's absolute mastery over nature is vividly displayed in His ability to restrain the immense power of the ocean. By establishing strict borders, God prevents the waters from overwhelming the earth. There are several ways to understand how God enforces this boundary. One approach views this as a physical shaping of the earth, where God carved out trenches and channels around the sea to delay the water and keep it from surging past its limits [רש"י, מצודת דוד]. Others understand it as a binding decree. God issued a firm law and clear border [רלב"ג, רמב"ן, תקות אנוש בשם רד"ק], shattering the ocean's power and halting its relentless expansion [אבן עזרא, ביאור שטיינזלץ]. This divine law was imposed directly upon the crashing breakers and waves themselves [רמב"ן].

From a broader philosophical perspective, this act involved breaking the very laws of physics. Naturally, water is a lighter element that should completely envelop the heavier earth. During creation, God shattered this natural tendency, forcing the oceans to gather in one place against their nature so that dry land could emerge [תקות אנוש]. In a similar vein, this forceful retreat of the waters is compared to the intense physical crisis of childbirth, as if the ocean gave birth to the dry land when the waters withdrew under divine command [מלבי"ם].

To illustrate the sheer force required to hold the ocean back, the imagery of a fortified city is used. Just as a fortress is secured with heavy doors and a solid locking bar, God forcibly locks the sea in its place, compelling it to remain within its borders [מצודת דוד, מצודת ציון, מלבי"ם, תקות אנוש, ביאור שטיינזלץ]. The specific need for both doors and a locking bar points to a historical shift. At the dawn of creation, doors alone were enough to hold back the sea. However, after the generation of Enosh sinned, the ocean breached its boundaries and flooded a third of the world. Once that original limit was broken and divine justice was unleashed, God had to add a locking bar to the doors, creating a double layer of protection to ensure the waters would never again wash over the earth [אלשיך].