Isaiah 6:7 WBT

⁵  Then said I, Woe [is] me! for I am undone; because I [am] a man of unclean lips, and I dwell in the midst of a people of unclean lips: for my eyes have seen the King, the LORD of hosts.

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

⁷  And he laid [it] upon my mouth, and said, Lo, this hath touched thy lips; and thy iniquity is taken away, and thy sin purged.

⁸  Also I heard the voice of the Lord, saying, Whom shall I send, and who will go for us? Then said I, Here [am] I; send me.

⁹  And he said, Go, and tell this people, Hear ye indeed, but understand not; and see ye indeed, but perceive not.