Ezekiel 41:10

And between it and the wall chambers was a width of twenty cubits all around the temple on every side.

Surrounding context

41:9 The thickness of the outer wall of the side chambers was five cubits, and so also the remaining terrace by the place of the side chambers of the temple.

41:10 And between it and the wall chambers was a width of twenty cubits all around the temple on every side.

41:11 The doors of the side chambers opened on the terrace, one door toward the north and another toward the south; and the width of the terrace was five cubits all around.

Translation and sources