וַיֵּרְדוּ֮ אֵלָיו֒ וַיִּתְפַּלֵּ֨ל אֱלִישָׁ֤ע אֶל־יְהוָה֙ וַיֹּאמַ֔ר הַךְ־נָ֥א אֶת־הַגּוֹי־הַזֶּ֖ה בַּסַּנְוֵרִ֑ים וַיַּכֵּ֥ם בַּסַּנְוֵרִ֖ים כִּדְבַ֥ר אֱלִישָֽׁע׃
And when they came down to him, Elisha prayed unto the LORD, and said: ‘Smite this people, I pray Thee, with blindness.’ And He smote them with blindness according to the word of Elisha.
Read Kabbalistic (mystical) interpretations of II Kings 6:18: Zohar and classical Jewish mystical sources, free online.