Isaiah 6:5-7

5So I said, “Oh, no! I’m doomed. Every word that passes through my lips is sinful. I live among people with sinful lips. I have seen the king, the Lord of Armies!”

6Then one of the angels flew to me. In his hand was a burning coal that he had taken from the altar with tongs.

7He touched my mouth with it and said, “This has touched your lips. Your guilt has been taken away, and your sin has been forgiven.”