וַיֵּ֙לֶךְ֙ הַנָּבִ֔יא וַיַּעֲמֹ֥ד לַמֶּ֖לֶךְ עַל־הַדָּ֑רֶךְ וַיִּתְחַפֵּ֥שׂ בָּאֲפֵ֖ר עַל־עֵינָֽיו׃
So the prophet departed, and waited for the king by the way, and disguised himself with his headband over his eyes.
Read midrashic interpretation of I Kings 20:38: and classical rabbinic exegesis.