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. AT: "He waters the mountains by causing the rains to fall from the sky" (See: rc://en/ta/man/translate/figs-metaphor)

the fruit of his labor

"the many good things that you create"