Isaiah 6:2-4 Revised Standard Version (RSV)
2 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. 3 And one called to another and said:
“Holy, holy, holy is the Lord of hosts;
4 And the foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke.