Flavius Josephus, Antiquities of the Jews
William Whiston, A.M., Ed.

[71] Now when the king had divided the temple into two parts, he made the inner house of twenty cubits [every way], to be the most secret chamber, but he appointed that of forty cubits to be the sanctuary; and when he had cut a door-place out of the wall, he put therein doors of Cedar, and overlaid them with a great deal of gold, that had sculptures upon it. He also had veils of blue, and purple, and scarlet, and the brightest and softest linen, with the most curious flowers wrought upon them, which were to be drawn before those doors. He also dedicated for the most secret place, whose breadth was twenty cubits, and length the same, two cherubims of solid gold; the height of each of them was five cubits ¹ they had each of them two wings stretched out as far as five cubits; wherefore Solomon set them up not far from each other, that with one wing they might touch the southern wall of the secret place, and with another the northern: their other wings, which joined to each other, were a covering to the ark, which was set between them; but nobody can tell, or even conjecture, what was the shape of these cherubims. He also laid the floor of the temple with plates of gold; and he added doors to the gate of the temple, agreeable to the measure of the height of the wall, but in breadth twenty cubits, and on them he glued gold plates. And, to say all in one word, he left no part of the temple, neither internal nor external, but what was covered with gold. He also had curtains drawn over these doors in like manner as they were drawn over the inner doors of the most holy place; but the porch of the temple had nothing of that sort.