All commentators agree that this verse uses vivid poetry to describe the events at Mount Sinai when God gave the law. The 'skipping mountains' refers to the literal earthquake and commotion (Exodus 19:18) that demonstrated God's immense power. Scholars like Barnes and Ellicott note the Hebrew word for 'skipped' can also mean 'to dance,' suggesting creation itself responds with active, joyful awe in the presence of its Creator.