Isaiah 6:2-5

²Upon it stood the seraphims: the one had six wings, and the other had six wings: with two they covered his face, and with two they covered his feet, and with two they hew.b

³And they cried one to another, and said: Holy, holy, holy, the Lord God of hosts, all the earth is full of his glory.c

⁴And the lintels of the doors were moved at the voice of him that cried, and the house was filled with smoke.

⁵And I said: Woe is me, because I have held my peace; because I am a man of unclean lips, and I dwell in the midst of a people that hath unclean lips, and I have seen with my eyes the King the Lord of hosts.d