Isaiah 6:6-8
6 Then one of the seraphim flew to me, having in his hand a live coal which he had taken with the tongs from the altar. 7 And he touched my mouth with it, and said:
"Behold, this has touched your lips;
Your iniquity is taken away,
And your sin purged."
8 Also I heard the voice of the Lord, saying:
"Whom shall I send,
And who will go for Us?"
Then I said, "Here am I! Send me."
NKJV
6 Then one of the seraphim flew to me, having in his hand a live coal which he had taken with the tongs from the altar. 7 And he touched my mouth with it, and said:
"Behold, this has touched your lips;
Your iniquity is taken away,
And your sin purged."
8 Also I heard the voice of the Lord, saying:
"Whom shall I send,
And who will go for Us?"
Then I said, "Here am I! Send me."
NKJV