John Wesley on Exodus 24:10

They saw the God of Israel - That is, they had some glimpse of his glory, in light and fire, though they saw no manner of similitude. They saw the place where the God of Israel stood, so the seventy, something that came near a similitude, but was not; whatever they saw it was certainly something of which no image or picture could be made, and yet enough to satisfy them that God was with them of a truth. Nothing is described but that which was under his feet, for our conceptions of God are all below him. They saw not so much as God's feet, but at the bottom of the brightness they saw (such as they never saw before or after, and as the foot - stool or pedestal of it) a most rich and splendid pavement, as it had been of sapphires, azure, or sky - coloured. The heavens themselves are the pavement of God's palace, and his throne is above the firmament.