John Gill Commentary Ezekiel 40:25

"And there were windows in it and in the arches thereof round about, like those windows: the length was fifty cubits, and the breadth five and twenty cubits." — Ezekiel 40:25 (ASV)

And there were windows in it, and in the arches thereof round
about
That is, in the little chambers, though not expressed; and in the porches of them on each side, as you passed from the outer to the inner gate: like those windows ;
that were in the chambers that were in the east and north gates, (Ezekiel 40:7Ezekiel 40:16Ezekiel 40:22) , the length was fifty cubits, and the breadth five and twenty cubits ;
see (Ezekiel 40:13Ezekiel 40:15) .