Isaiah 6:5 KJV

3And one cried unto another, and said, Holy, holy, holy, is the LORD of hosts: the whole earth is full of his glory.

4And the posts of the door moved at the voice of him that cried, and the house was filled with smoke.

5Then 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 mine eyes have seen the King, the LORD of hosts.

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

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