תהלים, פרק ק״ד, פסוק י״ג

God's care for creation is clearly seen in the wondrous cycle of rain, designed to revive the earth and nourish the plant life created on the third day. This divine wisdom is built into the water cycle, ensuring that both the highest peaks and the lowest valleys receive the moisture they need to thrive.

Mountains are a specific focus of this divine care because they require rain far more urgently than valleys and plains. Due to their great height, they do not benefit from natural springs, and humans cannot manually irrigate them using river water [רד״ק, ביאור שטיינזלץ]. Therefore, God directly waters these high places from His upper chambers. The primary approach among commentators is that these upper chambers refer to the clouds and vapors that rise into the sky to form rain. Although these vapors originate from the earth, their ascent into the heights earns them the title of God's chambers [תורה תמימה, רד״ק, מצודת דוד, מלבי״ם, מאירי]. A more spiritual perspective suggests that the mountains are watered from the heavenly waters held aloft by God's command, or from the pure essence of the waters of the Garden of Eden [תורה תמימה, אלשיך].

Through this process, the earth is satisfied by the fruit of God's works. Most commentators agree that this fruit is the rain itself, which is the direct product of the clouds and a marvel of divine design [רד״ק, מצודת דוד, מאירי, תורה תמימה]. This rain is sometimes described as the condensation of the upper waters, providing moisture to the earth without ever depleting the heavenly supply [אלשיך]. However, a different view suggests that the fruit of God's works is not the rain, but rather the trees and plants that sprout as a result of the downpour [אבן עזרא].

Ultimately, this system ensures the entire world is fully satisfied. While the towering mountains receive their moisture directly from the ascending vapors and clouds, the rest of the land and all living creatures find their nourishment in the widespread rain and the flowing streams it creates, completely soaking the ground below [מלבי״ם, ביאור שטיינזלץ].