The foundation was of costly stones By costly stones, mentioned here, and in the foregoing and following verses, are not meant precious stones, but stones that, being larger, firmer, and better polished than others, were of greater price: probably they were large blocks of marble, squared and polished on all sides. Stones of ten cubits Not ten cubits square, which would have been unnecessary, and would have rendered them unportable and unmanageable, but of such measure as is generally used in measuring stones and timber; and thus also the following eight cubits are to be understood. And above That is, in the roof, or upper part; for this is opposed to the foundation. Were costly stones and cedars Intermixed the one with the other. Thus the roof was finished after the same manner with the lower parts.
Related Commentaries of 1 Kings 7:10
1 Kings 7:10-11
10 And the foundation was of costly stones, even great stones, stones of ten cubits, and stones of eight cubits.
11 And above were costly stones, after the measures of hewed stones, and cedars.