The best rendering of this obscure verse seems to be:

From the brightness before him there passed through his thick clouds hailstones and coals of fire.

The flashes of lightning, accompanied by hail (Exodus 9:23-24), are as it were rays of the "unapproachable light" in which He dwells, piercing through the dense clouds which conceal Him. The text in 2 Sam. which has only, "at the brightness before him coals of fire were kindled," is evidently mutilated.

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