He built twenty cubits of the rear of the house with boards of cedar from the floor to the rafters; he built it within for the sanctuary, the Holy of Holies.
Against the wall of the house he built chambers running round the walls of the house both of the Holy Place and of the Holy of Holies; and he made side chambers all around.
He made the Most Holy Place, its length equaling the breadth of the house, twenty cubits, and its breadth twenty cubits; he overlaid it with 600 talents of fine gold.
And he measured the length [of the interior of the second room] in the temple proper, twenty cubits, and the breadth, twenty cubits; and he [came out and] said to me, This is the Most Holy Place (the Holy of Holies).
And in this sacred section you shall measure off a portion 25,000 cubits in length and 10,000 cubits in breadth. And in it shall be the sanctuary which is most holy.
The Lord said to Moses, Tell Aaron your brother he must not come at all times into the Holy of Holies within the veil before the mercy seat upon the ark, lest he die; for I will appear in the cloud on the mercy seat. [Heb. 9:7-15, 25-28.]