Isaiah 6:7 WEB

⁵  Then I said, 'Woe is me! For I am undone, because 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, Yahweh of Hosts!'

⁶  Then one of the seraphim flew to me, having a live coal in his hand, which he had taken with the tongs from off the altar.

⁷  He touched my mouth with it, and said, 'Behold, this has touched your lips; and your iniquity is taken away, and your sin forgiven.'

⁸  I heard the Lord's voice, saying, 'Whom shall I send, and who will go for us?' Then I said, 'Here I am. Send me!'

⁹  He said, 'Go, and tell this people, 'You hear indeed, But don't understand; And you see indeed, But don't perceive.'