וַיֵּצֵ֞א הַמֶּ֧לֶךְ יְהוֹרָ֛ם בַּיּ֥וֹם הַה֖וּא מִשֹּׁמְר֑וֹן וַיִּפְקֹ֖ד אֶת־כָּל־יִשְׂרָאֵֽל׃
And king Jehoram went out of Samaria at that time, and mustered all Israel.
Read midrashic interpretation of II Kings 3:6: and classical rabbinic exegesis.