And he built twenty cubits on the sides of the house, both the floor and the walls with boards of cedar: he even built them for it inside, even for the inner sanctuary, even for the most holy place.
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Bede
AD 735
He calls the east side of the temple the rear; for the temple had its entrance on the east and its inner house, that is, the Holy of Holies, on the west. The fact that he says that the board partitions that separated the inner house from the outer one were erected from the floor to the top does not mean they were built to the ceiling, which was at the height of thirty cubits from the floor, as has already been said above, but only up to a height of twenty cubits, as one can clearly read in what follows. But the portion above these partitions up as far as the ceiling was left open and empty to a height of ten cubits and a length of twenty cubits across the width of the house, and, of course, through this aperture the smoke of the burnt offerings from the altar of sacrifice used to ascend and penetrate all the way in to cover the ark of the Lord. This division of the Lord’s house is a clear figure of a mystery and, thanks to the explanation of the apostle, is clearer than daylight becaus...
The inner house of the oracle. That is, the sanctuary, which he separated from the other part of the temple, with this partition of cedar, instead of the veil, which in the tabernacle of Moses hung before the sanctuary. (Challoner)
It was a square of 20 cubits, extending from the western end. (Haydock)
Hither none but the high priest was allowed to enter, and he but once a year. (Calmet)