John 12:39 YLT

³⁷  yet he having done so many signs before them, they were not believing in him,

³⁸  that the word of Isaiah the prophet might be fulfilled, which he said, 'Lord, who gave credence to our report? and the arm of the Lord -- to whom was it revealed?'

³⁹  Because of this they were not able to believe, that again Isaiah said,

⁴⁰  'He hath blinded their eyes, and hardened their heart, that they might not see with the eyes, and understand with the heart, and turn back, and I might heal them;'

⁴¹  these things said Isaiah, when he saw his glory, and spake of him.