Isaiah 6:6-8

Then out of the smoke, one of the angels of fire flew to me. He had in his hands a burning coal he had taken from the altar with tongs. He touched my lips with it and said, “See? The burning coal from the altar has touched your lips. Your guilt is taken away; your sin is blotted out.” Then I heard the Lord saying, “Whom should I send to my people? Who will go to represent us?” I spoke up and said, “I will be the one. Send me.”