2 Chronicles 3:8

Now he made the room of the holy of holies: its length across the width of the house was twenty cubits, and its width was twenty cubits; and he overlaid it with fine gold, amounting to 600 talents.

Exodus 26:33

You shall hang up the veil under the clasps, and shall bring in the ark of the testimony there within the veil; and the veil shall serve for you as a partition between the holy place and the holy of holies.

1 Kings 6:16

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, even as the most holy place.

1 Kings 6:19-20

Then he prepared an inner sanctuary within the house in order to place there the ark of the covenant of the Lord.

Hebrews 9:3

Behind the second veil there was a tabernacle which is called the Holy of Holies,

Hebrews 9:9

which is a symbol for the present time. Accordingly both gifts and sacrifices are offered which cannot make the worshiper perfect in conscience,

Hebrews 10:19

Therefore, brethren, since we have confidence to enter the holy place by the blood of Jesus,

Treasury of Scripture Knowledge

Summary

And he made the most holy house, the length whereof was according to the breadth of the house, twenty cubits, and the breadth thereof twenty cubits: and he overlaid it with fine gold, amounting to six hundred talents.

Bible References

The most holy

Exodus 26:33
You shall hang up the veil under the clasps, and shall bring in the ark of the testimony there within the veil; and the veil shall serve for you as a partition between the holy place and the holy of holies.
1 Kings 6:19
Then he prepared an inner sanctuary within the house in order to place there the ark of the covenant of the Lord.
Hebrews 9:3
Behind the second veil there was a tabernacle which is called the Holy of Holies,
Hebrews 10:19
Therefore, brethren, since we have confidence to enter the holy place by the blood of Jesus,