2 Chr 18:29

וַיֹּאמֶר֩ מֶ֨לֶךְ יִשְׂרָאֵ֜ל אֶל־יְהוֹשָׁפָ֗ט הִתְחַפֵּשׂ֙ וָב֣וֹא בַמִּלְחָמָ֔ה וְאַתָּ֖ה לְבַ֣שׁ בְּגָדֶ֑יךָ וַיִּתְחַפֵּשׂ֙ מֶ֣לֶךְ יִשְׂרָאֵ֔ל וַיָּבֹ֖אוּ בַּמִּלְחָמָֽה׃

And the king of Israel said to Jehoshaphat, “I will disguise myself and go into battle, but you wear your royal robes.” So the king of Israel disguised himself and went into battle.