Isaiah 6:5-7

New Revised Standard Version, Anglicised Catholic Edition

⁵ And I said: ‘Woe is me! I am lost, for I am a man of unclean lips, and I live among a people of unclean lips; yet my eyes have seen the King, the Lord of hosts!’

⁶ Then one of the seraphs flew to me, holding a live coal that had been taken from the altar with a pair of tongs. ⁷ The seraph^[a] touched my mouth with it and said: ‘Now that this has touched your lips, your guilt has departed and your sin is blotted out.’