Isaiah 6:5-6

5And I said: “Woe is me! aFor I am lost; bfor 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 cKing, the Lord of hosts!”

6Then one of the seraphim flew to me, having in his hand a burning coal that he had taken with tongs from the altar.
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