6:1 In the year that King Uzziah died I saw the Lord sitting upon a throne, high and lifted up; and the train of his robe filled the temple. 2 Above him stood the seraphim. Each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. 3 And one called to another and said:

  “Holy, holy, holy is the LORD of hosts;
  the whole earth is full of his glory!”

4 And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. 5 And I said: “Woe is me! For I am lost; for I am a man of unclean lips, and I dwell in the midst of a people of unclean lips; for my eyes have seen the King, the LORD of hosts!”

6 Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar. 7 And he touched my mouth and said: “Behold, this has touched your lips; your guilt is taken away, and your sin atoned for.”

8 And I heard the voice of the Lord saying, “Whom shall I send, and who will go for us?” Then I said, “Here I am! Send me.” 9 And he said, “Go, and say to this people:

  “‘Keep on hearing, but do not understand;
  keep on seeing, but do not perceive.’
10   Make the heart of this people dull,
    and their ears heavy,
    and blind their eyes;
  lest they see with their eyes,
    and hear with their ears,
  and understand with their hearts,
    and turn and be healed.”

(ESV)