They saw the God of Israel. These words can scarcely mean less than that they saw with their bodily eyes some appearance of the Divine being who had summoned them to his presence for the purpose. Moses, we know, saw a "similitude of God" (Numbers 12:8).
Isaiah "saw the Lord sitting upon his throne "(Isaiah 6:1). Ezekiel saw upon the throne "the appearance of a man" (Ezekiel 1:26). It does not follow from Deuteronomy 4:12, Deuteronomy 4:15, that the elders saw no similitude, since in that passage Moses is speaking, not to the elders, but to the people, and referring, not to what occurred at the sacrificial feast after the ratification of the covenant, but to the scene at the giving of the Ten Commandments previously (Exodus 20:1-18).
What the form was which the elders saw, we are not told; but as it had "feet," it was probably a human form. It may have been hazy, indefinite, "too dazzling bright for mortal eye" to rest upon. But it was a true "vision of God"—and, as Keil says, "a foretaste of the blessedness of the sight of God in eternity."
There was under his feet, as it were, a paved work of a sapphire stone. Rather, "and under his feet was, as it were, a work of clear sapphire." Nothing is said concerning a pavement, but only that below the feet of the figure which they saw was something, which looked as if it were made of bright blue sapphire stone, something as clear and as blue as the blue of heaven.
Canon Cook supposes the actual sky to be meant; but the expression, "as it were, the body of heaven," or "like the very heaven," makes this impossible. A thing is not like itself.