Isaiah 6:1-7

In the year that King Uzziah died, I saw [in a vision] the Lord sitting on a throne, high and exalted, with the train of His royal robe filling the [most holy part of the] temple. [John 12:41] Above Him seraphim (heavenly beings) stood; each one had six wings: with two wings he covered his face, with two wings he covered his feet, and with two wings he flew. And one called out to another, saying, “Holy, Holy, Holy is the LORD of hosts; The whole earth is filled with His glory.” And the foundations of the thresholds trembled at the voice of him who called out, and the temple was filling with smoke. Then I said, “Woe is me! For I am ruined, Because I am a man of [ceremonially] unclean lips, And I live among a people of unclean lips; For my eyes have seen the King, the LORD of hosts.” Then one of the seraphim flew to me with a burning coal in his hand, which he had taken from the altar with tongs. He touched my mouth with it and said, “Listen carefully, this has touched your lips; your wickedness [your sin, your injustice, your wrongdoing] is taken away and your sin atoned for and forgiven.”