Isaiah 6:5-9 NIV

[5] “Woe to me!” I cried. “I am ruined! For I am a man of unclean lips, and I live among a people of unclean lips, and my eyes have seen the King, the LORD Almighty.” [6] Then one of the seraphim flew to me with a live coal in his hand, which he had taken with tongs from the altar. [7] With it he touched my mouth and said, “See, this has touched your lips; your guilt is taken away and your sin atoned for.” [8] Then I heard the voice of the Lord saying, “Whom shall I send? And who will go for us?” And I said, “Here am I. Send me!” [9] He said, “Go and tell this people: “ ‘Be ever hearing, but never understanding; be ever seeing, but never perceiving.’