Isaiah 6:5

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

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

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

⁶  Then 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:

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