“The mountains melted from before the LORD, even that Sinai from before the LORD God of Israel.”
King James Version (KJV)
5:5 Melted - Or, flowed, with floods of water powered out of the clouds upon them, and from them flowing down in a mighty stream upon the lower grounds, and carrying down part of the mountains with it. Sinai - She slides into the mention of a more ancient appearance of God for his people in Sinai; it being usual in scripture repetitions of former actions, to put divers together in a narrow compass. The sense is, No wonder that the mountains of the Amorites and Canaanites melted and trembled, when thou didst lead thy people toward them; for even Sinai itself could not bear thy presence, but melted in like manner before thee.