Ezekiel 41:5-6

Then he measured the wall of the temple, six cubits thick, and the breadth of a the side chambers, four cubits, b all around the temple. And the side chambers were in three stories, one over another, c thirty in each story. There were offsets
Septuagint, compare 1 Kings 6:6; the meaning of the Hebrew word is uncertain
all around the wall of the temple to serve as supports for the side chambers, e so that they should not be supported by the wall of the temple.
Copyright information for ESV