Isaiah 6:2-6

2Above Him seraphim (heavenly beings) stood; each one had six wings: with two wings he covered his face, with two wings he covered his feet, and with two wings he flew.

3And one called out to another, saying, “Holy, Holy, Holy is the Lord of hosts; The whole earth is filled with His glory.”

4And the foundations of the thresholds trembled at the voice of him who called out, and the temple was filling with smoke.

5Then I said, “Woe is me! For I am ruined, Because I am a man of [ceremonially] unclean lips, And I live among a people of unclean lips; For my eyes have seen the King, the Lord of hosts.”

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