1 Kings 7:43-47

And the ten bases, and ten lavers on the bases;

And one sea, and twelve oxen under the sea;

And the pots, and the shovels, and the basons: and all these vessels, which Hiram made to king Solomon for the house of the LORD, were of bright brass.

In the plain of Jordan did the king cast them, in the clay ground between Succoth and Zarthan.

And Solomon left all the vessels unweighed, because they were exceeding many: neither was the weight of the brass found out.