In the year that King Uzziah died, I saw the Lord seated on a throne, high and exalted, and the train of his robe filled the temple. Above him were seraphim, each with six wings: With two they covered their face, with two they covered their feet, and with two they flew. And they called to each other: "Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory."
At the sound of their voices the doorposts and thresholds shook and the temple was filled with smoke.
"Woe to me!" I cried. "I am lost! For I am a man of unclean lips, and I dwell among a people of unclean lips, and my eyes have seen the King, the LORD of hosts."
Then one of the seraphim flew to me with a live coal in his hand, which he had taken with tongs from the altar. With it he touched my mouth and said, "Behold, this has touched your lips; your guilt is taken away and your sin atoned for."
Then I heard the voice of the Lord saying, "Whom shall I send and who will go for us?"
And I said, "Here I am. Send me!"
[Isaiah 6:1-8]
