Ezekiel 41:4

He measured its length, twenty cubits, and the width, twenty cubits, before the nave; and he said to me, “This is the most holy place.”

1 Kings 6:20

The inner sanctuary was twenty cubits in length, twenty cubits in width, and twenty cubits in height, and he overlaid it with pure gold. He also overlaid the altar with cedar.

Hebrews 9:3-8

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

Exodus 26:33-34

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.

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.

1 Kings 6:5

Against the wall of the house he built stories encompassing the walls of the house around both the nave and the inner sanctuary; thus he made side chambers all around.

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.

Revelation 21:16

The city is laid out as a square, and its length is as great as the width; and he measured the city with the rod, fifteen hundred miles; its length and width and height are equal.

Treasury of Scripture Knowledge

Summary

So he measured the length thereof, twenty cubits; and the breadth, twenty cubits, before the temple: and he said unto me, This is the most holy place.

Bible References

Twenty cubits

1 Kings 6:20
The inner sanctuary was twenty cubits in length, twenty cubits in width, and twenty cubits in height, and he overlaid it with pure gold. He also overlaid the altar with cedar.
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.
Revelation 21:16
The city is laid out as a square, and its length is as great as the width; and he measured the city with the rod, fifteen hundred miles; its length and width and height are equal.

This

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.
Hebrews 9:3
Behind the second veil there was a tabernacle which is called the Holy of Holies,