Isaiah 6:5-8

Then I said, “Woe is me! For I am undone, because I am a man of unclean lips and I live amongst a people of unclean lips, for my eyes have seen the King, the LORD of Armies!” 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. He touched my mouth with it, and said, “Behold, this has touched your lips; and your iniquity is taken away, and your sin forgiven.” 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!”