Albert Barnes Commentary Psalms 104:13

"He watereth the mountains from his chambers: The earth is filled with the fruit of thy works." — Psalms 104:13 (ASV)

He watereth the hills from his chambers - The waters, as stated before, run in the valleys—in the natural channels made for them among the hills (Psalms 104:10). But still, it was a fact that the hills themselves were watered. There were springs far up their heights, and vegetation was sustained above the reach of the fountains and streams below. This was a proof of the divine skill and beneficence that, in some way, water was furnished on the summits and sides of the hills themselves. This was caused, the psalmist says, by God’s pouring water on them, as it were, from His own “chambers”—His abode on high.

The allusion is, doubtless, to rain, which seems to be poured down from the very abode of God. The word rendered “chambers” means “upper rooms,” (see the notes at Psalm 104:3); and the reference is to the dwelling-place of God, as far above the earth.

The earth is satisfied with the fruit of thy works - Your doings; with what You have done. All the needs of the earth seem to be met and “satisfied”; all that it could desire to make it fertile and beautiful, and the proper abode of man, of beast, and of fowl, has been granted. It has no cause of complaint. Nothing has been left undone—in the valleys or on the hills, on the dry land or in the waters—that was needful to be done to carry out the purpose for which it has been called into being.