Ezekiel 41:4

He measured the length and breadth thereof, which were every one twenty cubits, before the temple. And he said unto me, "This is the holiest of all."

1 Kings 6:20

And the quyre was twenty cubits long, and twenty in breadth and twenty in height. And he sealed it with pure gold, and boarded the altar with Cedar.

Hebrews 9:3-8

But within the second veil was there a tabernacle, which is called holiest of all,

Exodus 26:33-34

And thou shalt hang up the veil with rings, and shall bring in within the veil, the ark of witness. And the veil shall divide the holy from the most holy.

2 Chronicles 3:8

And he made the house most holy, whose length was twenty cubits like to the breadth of the house, and the breadth thereof was also twenty cubits. And he overlaid it with the best gold, that drew to the sum of six hundred talents.

1 Kings 6:5

And under the walls of the house he made galleries round about, both round about the temple and also the quyre. And so made sides round about.

1 Kings 6:16

And he sealed twenty cubits in the end of the temple, both floor and walls, with Cedar, and dressed it within to be the quyre and place most holy.

Revelation 21:16

And the city was built four square, and the length was as large as the breadth of it, and he measured the city with the reed twelve thousand furlongs: and the length, and the breadth, and the height of it, were 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 quyre was twenty cubits long, and twenty in breadth and twenty in height. And he sealed it with pure gold, and boarded the altar with Cedar.
2 Chronicles 3:8
And he made the house most holy, whose length was twenty cubits like to the breadth of the house, and the breadth thereof was also twenty cubits. And he overlaid it with the best gold, that drew to the sum of six hundred talents.
Revelation 21:16
And the city was built four square, and the length was as large as the breadth of it, and he measured the city with the reed twelve thousand furlongs: and the length, and the breadth, and the height of it, were equal.

This

Exodus 26:33
And thou shalt hang up the veil with rings, and shall bring in within the veil, the ark of witness. And the veil shall divide the holy from the most holy.
Hebrews 9:3
But within the second veil was there a tabernacle, which is called holiest of all,