Charles Ellicott Commentary 2 Chronicles 4:18

"Thus Solomon made all these vessels in great abundance: for the weight of the brass could not be found out." — 2 Chronicles 4:18 (ASV)

Thus Solomon made all these vessels in great abundance. — 1 Kings 7:47, And Solomon left all the vessels (unweighed) from very great abundance. Our text may be due to a copyist, whose eye wandered to the beginning of the next verse; but it is possible that the chronicler missed the significance of the verb used in Kings, and therefore substituted an easier term. The further changes—"unto great abundance," "for the weight," etc.—suggest this account of the matter.

Could not be found out. — Was not ascertained.