Isa 6:6-8

6Then one of the seraphs flew to me, holding a live coal that had been taken from the altar with a pair of tongs.7The seraph touched my mouth with it and said: “Now that this has touched your lips, your guilt has departed and your sin is blotted out.”8Then 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!”