Isaiah 6:6-7

Amplified Bible, Classic Edition

⁶ Then flew one of the seraphim [heavenly beings] to me, having a live coal in his hand which he had taken with tongs from off the altar;

⁷ And with it he touched my mouth and said, Behold, this has touched your lips; your iniquity and guilt are taken away, and your sin is completely atoned for and forgiven.