תהלים, פרק קמ״ח, פסוק ו׳

The eternal stability of the heavens and the laws of nature serve as a direct reflection of God's greatness. The celestial bodies and the upper waters are firmly fixed in their places, operating in a perfect, enduring order that preserves the existence of all creation. This placement is meant to emphasize absolute permanence [מצודת ציון]. The primary approach among commentators is that this positioning represents an eternal and unchanging reality. There is a clear contrast between earthly life and the heavens. In the lower world, only a species as a whole survives while individual creatures eventually die. However, the celestial bodies were created so that every single entity endures forever, completely safe from destruction [רד״ק, מאירי]. This is because they are not made of the four standard material elements found on earth, freeing them from the cycle of decay and change [אבן עזרא]. From a human perspective, they stand as absolutely permanent fixtures of reality [ביאור שטיינזלץ].

The survival of the entire world relies on this permanent structure. Specifically regarding the waters positioned above the heavens, their eternal placement by God's command prevents them from crashing down. If they were to fall, the world would revert to a state of total chaos, making their fixed position the very foundation of the world's continued existence [אלשיך].

To maintain this perfect balance, God established specific decrees and natural orders at the dawn of creation [מצודת ציון, ביאור שטיינזלץ]. This absolute law precisely defines the exact role and timing for every created thing. For instance, it dictates that the sun serves during the day while the moon governs the night [רש״י, מצודת דוד], and it maps out the fixed, cyclical orbits of the stars [אבן עזרא]. A divine guarantee ensures that this natural order, set in motion at the beginning of time, will never be broken or altered [רד״ק, מאירי]. These laws of nature will never cease, ensuring that not a single celestial body will ever deviate from the unique purpose and rule assigned to it [אבן עזרא, מצודת דוד].