Isaiah 6:5, 7 NLT
[5] Then I said, "It’s all over! I am doomed, for I am a sinful man. I have filthy lips, and I live among a people with filthy lips. Yet I have seen the King, the Lord of Heaven’s Armies."
[7] He touched my lips with it and said, "See, this coal has touched your lips. Now your guilt is removed, and your sins are forgiven."
- P213