In the year that King Uzzi’ah died I saw the Lord sitting upon a throne, high and lifted up; and his train filled the temple. Above him stood the seraphim; each had six wings: with two he covered his face, and with two he covered his feet, and with two he flew. And one called to another and said: “Holy, holy, holy is the LORD of hosts; the whole earth is full of his glory.” And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke.
–Isaiah 6:1-4