1 Chronicles 22:3

Iron… the joinings; and brass . The very first Bible mention of metals ( Genesis 4:22 ) places these two together. Whence Solomon got his "abundance" of the latter we have read in 1 Chronicles 18:8 ; for the "abundance' of the former he would not necessarily go further than his own land. Although the expression, "the land whose stones are iron" ( Deuteronomy 8:9 ), is possibly enough a poetical figure where it stands, yet some of the force of the figure may have sprung from its nearness to fact. The abundant use of iron in a great variety of tools, implements, weapons, and the knowledge of it in bar and sheet, might be illustrated from a large number of quotations from Scripture ( Deuteronomy 19:5 ; Deuteronomy 27:5 ; 2 Samuel 12:31 ; 2 Kings 6:5 ; Isaiah 10:34 ; Amos 1:3 ; and many others). The "joinings" were the clamps and plates of various size and shape, which held strongly together, whether beams of wood or blocks of stone.