Exod 25:23

“A dividing wall of cedar planks, twenty cubits high, was built in the temple to separate the inner sanctuary, that is, the Holy of Holies, from the forepart of the temple. The innersanctuary was twenty cubits deep, twenty cubits wide and twenty cubits high. The [part of the temple] in front of the inner sanctuary was forty cubits long, and in it were tables and the golden candelabrum, as well as the golden altar near the door of the inner sanctuary. This was done so that when incense was offered upon it, the cloud of smoke might rise up and cover the inner sanctuary, where the ark of the covenant was, "and above it the cherubim of glory overshadowing the mercy seat."”