Isaiah 6:4-6

Revised Standard Version Catholic Edition

⁴ And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke. ⁵ And I said: “Woe is me! For I am lost; for 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 King, the Lord of hosts!”

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