Ezekiel 41:4

And he measureth its length twenty cubits, and the breadth twenty cubits, unto the front of the temple, and he saith unto me, 'This is the holy of holies.'

1 Kings 6:20

And before the oracle is twenty cubits in length, and twenty cubits in breadth, and twenty cubits is its height; and he overlayeth it with gold refined, and overlayeth the altar with cedar.

Hebrews 9:3-8

and after the second vail a tabernacle that is called 'Holy of holies,'

Exodus 26:33-34

'And thou hast put the vail under the hooks, and hast brought in thither within the vail the ark of the testimony; and the vail hath made a separation for you between the holy and the holy of holies.

2 Chronicles 3:8

And he maketh the most holy house: its length is by the front of the breadth of the house twenty cubits, and its breadth twenty cubits, and he covereth it with good gold, to six hundred talents;

1 Kings 6:5

And he buildeth against the wall of the house a couch round about, even the walls of the house round about, of the temple and of the oracle, and maketh sides round about.

1 Kings 6:16

And he buildeth the twenty cubits on the sides of the house with ribs of cedar, from the floor unto the walls; and he buildeth for it within, for the oracle, for the holy of holies.

Revelation 21:16

and the city lieth square, and the length of it is as great as the breadth; and he did measure the city with the reed -- furlongs twelve thousand; 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 before the oracle is twenty cubits in length, and twenty cubits in breadth, and twenty cubits is its height; and he overlayeth it with gold refined, and overlayeth the altar with cedar.
2 Chronicles 3:8
And he maketh the most holy house: its length is by the front of the breadth of the house twenty cubits, and its breadth twenty cubits, and he covereth it with good gold, to six hundred talents;
Revelation 21:16
and the city lieth square, and the length of it is as great as the breadth; and he did measure the city with the reed -- furlongs twelve thousand; the length, and the breadth, and the height, of it are equal;

This

Exodus 26:33
'And thou hast put the vail under the hooks, and hast brought in thither within the vail the ark of the testimony; and the vail hath made a separation for you between the holy and the holy of holies.
Hebrews 9:3
and after the second vail a tabernacle that is called 'Holy of holies,'