According to their form; either, 1. the form which was appointed for them by God, who signified it to David. Or rather,
2. The old form which God prescribed to Moses, Exodus 25:31, &c., for so these were made. And this clause seems to be added here, because in many things there was a great variation from the old form, as in the posture of the cherubims, the height of the altar, and divers other things.