Ezekiel 41:4

So he measured its length, twenty cubits; and its width, twenty cubits, beyond the temple: and he said unto me, This is the most holy place.

1 Kings 6:20

And the inner sanctuary was twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height: and he overlaid it with pure gold; and also covered the altar which was of cedar.

Hebrews 9:3-8

And behind the second veil, the tabernacle which is called the Holiest of all;

Exodus 26:33-34

And you shall hang up the veil from the clasps, that you may bring in there within the veil the ark of the testimony: and the veil shall divide unto you between the holy place and the most holy.

2 Chronicles 3:8

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

1 Kings 6:5

And against the wall of the house he built chambers round about, against the walls of the house round about, both of the temple and of the inner sanctuary: and he made chambers round about:

1 Kings 6:16

And he built twenty cubits on the sides of the house, both the floor and the walls with boards of cedar: he even built them for it inside, even for the inner sanctuary, even for the most holy place.

Revelation 21:16

And the city lies foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it 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
And the inner sanctuary was twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height: and he overlaid it with pure gold; and also covered the altar which was of cedar.
2 Chronicles 3:8
And he made the most holy place, the length of it was according to the breadth of the house, twenty cubits, and the breadth of it twenty cubits: and he overlaid it with fine gold, amounting to six hundred talents.
Revelation 21:16
And the city lies foursquare, and the length is as large as the breadth: and he measured the city with the reed, twelve thousand furlongs. The length and the breadth and the height of it are equal.

This

Exodus 26:33
And you shall hang up the veil from the clasps, that you may bring in there within the veil the ark of the testimony: and the veil shall divide unto you between the holy place and the most holy.
Hebrews 9:3
And behind the second veil, the tabernacle which is called the Holiest of all;