Leviticus 16:2

“There I will meet with you; and from above the mercy seat, from between the two cherubim which are upon the ark of the testimony, I will speak to you about all which I will command you for the sons of Israel.

“You shall put the mercy seat on the ark of the testimony in the Holy of Holies.

“And when the camp sets out, Aaron and his sons shall go in and they shall take down the veil of the screen and cover the ark of the testimony with it;

And he built twenty cubits on the rear part of the house with boards of cedar from the floor to the ceiling; he built them for it on the inside as an inner sanctuary, as the Holy of Holies.

Then Solomon said, “Yahweh has said that He would dwell in the cloud of dense gloom.

This hope we have as an anchor of the soul, a hope both sure and confirmed and one which enters within the veil,

And above it were the cherubim of glory overshadowing the mercy seat. Of these things we cannot now speak in detail.

And the sanctuary was filled with smoke from the glory of God and from His power; and no one was able to enter the sanctuary until the seven plagues of the seven angels were finished.