Isaiah 6:2-5

2Above it stood seraphim; each one had six wings: with two he covered his face, with two he covered his feet, and with two he flew.

3And one cried to another and said: “Holy, holy, holy is the Lord of hosts; The whole earth is full of His glory!”

4And the posts of the door were shaken by the voice of him who cried out, and the house was filled with smoke.

5So I said: “Woe is me, for I am undone! Because 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.”