Commentaries:
Barnes' Notes
Let the floods clap their hands - The rivers. Let them join in the universal praise. As if conscious of their beauty, their grandeur, their usefulness; as if sensible that all this was conferred by God; as if rejoicing in the goodness of God manifested to them, and through them, let them unite in the universal praise. Compare the notes at Isaiah 55:12.
Let the hills be joyful together - The mountains - in view of the goodness of God toward them - crowning them with beauty - clothing them with sublimity and grandeur - let them also rejoice in God as "their" God. Let all nature thus join in praise.
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