Ezekiel 41:4

And he will measure its length, twenty cubits; and the breadth, twenty cubits, to the face of the temple: and he will say to me, This the holy of holies.

1 Kings 6:20

And to the face of the oracle twenty cubits the length, and twenty cubits the breadth, and twenty cubits its height: and he will overlay it with gold shut up, and he will overlay the altar with cedar.

Hebrews 9:3-8

And after the second veil, the tent called Holy of Holies;

Exodus 26:33-34

And give the vail under the hooks, and bring in there from the inside of the vail, the ark of the testimony: and the vail separating to you between the holy and between the holy of holies.

2 Chronicles 3:8

And he will make the house of the holy of holies, its length upon the face of the breadth of the house, twenty cubits, and its breadth twenty cubits: and he will cover it with good gold to six hundred talents.

1 Kings 6:5

And he will build upon the wall of the house a floor round about the walls of the house round about for the temple, for the oracle: and he will make ribs round about

1 Kings 6:16

And he will build twenty cubits from the thighs of the house with ribs of cedars, from the bottom even to the walls: and he will build for it from within for the oracle to the holy of holies.

Revelation 21:16

And the city lies quadrangular, and her length is so large, such also the breadth: and he measured the city with the reed, at twelve thousand stadia. Her length, breadth, 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
And to the face of the oracle twenty cubits the length, and twenty cubits the breadth, and twenty cubits its height: and he will overlay it with gold shut up, and he will overlay the altar with cedar.
2 Chronicles 3:8
And he will make the house of the holy of holies, its length upon the face of the breadth of the house, twenty cubits, and its breadth twenty cubits: and he will cover it with good gold to six hundred talents.
Revelation 21:16
And the city lies quadrangular, and her length is so large, such also the breadth: and he measured the city with the reed, at twelve thousand stadia. Her length, breadth, and height are equal.

This

Exodus 26:33
And give the vail under the hooks, and bring in there from the inside of the vail, the ark of the testimony: and the vail separating to you between the holy and between the holy of holies.
Hebrews 9:3
And after the second veil, the tent called Holy of Holies;