וַיֹּ֕אמֶר לֵ֥ךְ וְאָמַרְתָּ֖ לָעָ֣ם הַזֶּ֑ה שִׁמְע֤וּ שָׁמ֙וֹעַ֙ וְאַל־תָּבִ֔ינוּ וּרְא֥וּ רָא֖וֹ וְאַל־תֵּדָֽעוּ׃
And He said: ‘Go, and tell this people: Hear ye indeed, but understand not; and see ye indeed, but perceive not.
Read midrashic interpretation of Isaiah 6:9: and classical rabbinic exegesis.