Matthew Poole and continuators on Ezekiel 1:26

26 And above the firmament that was over their heads was the likeness of a throne , as the appearance of a Saphyre stone; and upon the likeness of the throne was the likeness as the appearance of a man above it.

The Chrystalline Firmament which appeared in the Vision, not the vast expanse or Firmament in which are Sun, Moon, and Stars.

Heads of the living Creatures which moved the wheels and stood by the Chariot.

In view appeared a Saphyre stone, like or in likeness of a Throne, so the Heb. though we transpose the words somewhat in our Version; the Saphyre speaks splendor, and pretiousness; the Throne speaks the Authority and Power of him who sitteth thereon.

Christ God-Man who here appears as King and Judge to vindicate his own honour, to punish Rebels, and to give warning by his Prophet ere he execute his just but severe indignation.