en_tn_condensed/psa/104/013.md

He waters the mountains from his water chambers in the sky

This means that God causes it to rain. The waters are described as residing in chambers in the sky. Alternate translation: "He waters the mountains by causing the rains to fall from the sky" (See: rc://en/ta/man/jit/figs-metaphor)

the fruit of his labor

"the many good things that you create"