Isaiah 6
5 Ref 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 Ref 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 Ref 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 Ref 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!"