Ezekiel 41:4

And he measured its length [as] twenty cubits and [its] width [as] twenty cubits to [the] front of the temple, and he said to me, "This [is] {the most holy place}.

1 Kings 6:20

In front, the inner sanctuary [was] twenty cubits long and twenty cubits wide and twenty cubits high, and he overlaid it [with] pure gold and covered the altar [with] cedar.

Hebrews 9:3-8

And after the second curtain [was] a tent called the holy of holies,

Exodus 26:33-34

And you will put the curtain under the clasps, and you will bring the ark of the testimony there inside the curtain, and the curtain will separate for you between the holy and the {most holy place}.

2 Chronicles 3:8

Then he made {the most holy place}. Its length {was equal to} the width of the house: twenty cubits. And its breadth [was] twenty cubits. And he overlaid it with six hundred talents of fine gold.

1 Kings 6:5

and he built a structure against the wall of the temple [running] all along the walls of the house, for the outer sanctuary and for the inner sanctuary, and made side rooms all around.

1 Kings 6:16

He built twenty cubits from the rear of the house with boards of cedar from the floor up to the ceiling, and he built for it an inner sanctuary on the inside, as the {most holy place}.

Revelation 21:16

And the city is laid out as a square, and its length is the same as [its] width. And he measured the city with the measuring rod at twelve thousand stadia; the length and the width 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
In front, the inner sanctuary [was] twenty cubits long and twenty cubits wide and twenty cubits high, and he overlaid it [with] pure gold and covered the altar [with] cedar.
2 Chronicles 3:8
Then he made {the most holy place}. Its length {was equal to} the width of the house: twenty cubits. And its breadth [was] twenty cubits. And he overlaid it with six hundred talents of fine gold.
Revelation 21:16
And the city is laid out as a square, and its length is the same as [its] width. And he measured the city with the measuring rod at twelve thousand stadia; the length and the width and the height of it are equal.

This

Exodus 26:33
And you will put the curtain under the clasps, and you will bring the ark of the testimony there inside the curtain, and the curtain will separate for you between the holy and the {most holy place}.
Hebrews 9:3
And after the second curtain [was] a tent called the holy of holies,