1 Kings 6:6

6 On the first floor the side rooms were seven and a half feet wide. On the second floor they were nine feet wide. And on the third floor they were ten and a half feet wide. Solomon made the walls of the temple thinner as they went up floor by floor. The result was ledges along the walls. So the floor beams of the side rooms rested on the ledges. The beams didn't go into the temple walls.

1 Kings 6:6 Meaning and Commentary

1 Kings 6:6

And the nethermost chamber [was] five cubits broad
The nethermost row of them, which were upon the first floor:

and the middle [was] six cubits broad, and the third [was] seven cubits
broad;
so that the middlemost was a cubit larger than the lowest, and the highest a cubit larger than that: the reason of which was,

for without [in the wall] of the house he made narrowed rests round
about;
or rebatements; the thickness of the wall, as it was raised, became narrower at the height of every five cubits; thus the wall being supposed to be six cubits broad, as in ( Ezekiel 41:5 ) ; when it came to be five cubits high, it was narrowed a cubit, which left a projection, rebatement, or bench for the beams of the first chambers to be laid upon, which made the second row of chambers broader by a cubit; and the same being observed in the next story, made the highest a cubit broader than the middlemost: and this was done,

that [the beams] should not be fastened in the walls of the house;
or be inserted into them, which could not be done without making holes in it; and these holes could not be made without an iron instrument, and which was not to be used, as the next words show; whereas by the above method the beams of the chambers could be laid upon the buttresses, benches, or rebatements left, without the use of any: the gradual enlargement of these chambers, as they rose higher, may denote the enlargement of the church of God, both as to numbers, gifts, and grace, the nearer it comes to the heavenly state, as in the spiritual and personal reign of Christ.

1 Kings 6:6 In-Context

4 Solomon made narrow windows high up in the temple walls.

5 He built side rooms around the temple. They were built against the walls of the main hall and the Most Holy Room.

6 On the first floor the side rooms were seven and a half feet wide. On the second floor they were nine feet wide. And on the third floor they were ten and a half feet wide. Solomon made the walls of the temple thinner as they went up floor by floor. The result was ledges along the walls. So the floor beams of the side rooms rested on the ledges. The beams didn't go into the temple walls.

7 All of the stones that were used for building the temple were shaped where they were cut. So hammers, chisels and other iron tools couldn't be heard where the temple was being built.

8 The entrance to the first floor was on the south side of the temple. A stairway led up to the second floor. From there it went on up to the third floor.