Charles H. Spurgeon on Psalms 68:4

Upon the heavens. The ancient versions in general render the word twkrek super occasus, or occasum. The desert or solitude is the proper and general meaning of it, and there is no authority to render it by the heavens, but that of the Rabbins, which, indeed, is little or none; and of the Chaldee paraphrase which gives it twbrek hyrqy hyorwk super thronam gloriae ejus in nono caelo who sits upon the throne of his glory in the ninth heaven. The psalmist here alludes, as I apprehend, to the passage of the Israelites through the deserts in their way to the promised land, and describes it in many of the principal circumstances of it in the following verses; and God is said to ride, or be carried through the deserts, as the ark of his presence was carried through them, and accompanied the Israelites in all their various stages during their continuance and pilgrimage in them. Samuel Chandler.