1 Kings 7:43-47

and the ten stands with the ten basins on the stands;

and the one Sea and the twelve oxen under the Sea;

and the buckets, the shovels, and the bowls; indeed, all these utensils which Hiram made for King Solomon in the house of the Lord were of polished bronze.

The king had them cast in the plain of the Jordan, in the clay ground between Succoth and Zarethan.

However, Solomon left all the utensils unweighed, because they were too many; the weight of the bronze could not be determined.