I Samuel 17:6 Midrash

וּמִצְחַ֥ת נְחֹ֖שֶׁת עַל־רַגְלָ֑יו וְכִיד֥וֹן נְחֹ֖שֶׁת בֵּ֥ין כְּתֵפָֽיו׃

And he had greaves of brass upon his legs, and a javelin of brass between his shoulders.

Read midrashic interpretation of I Samuel 17:6: and classical rabbinic exegesis.