Isa 6:2-4

2Seraphs were in attendance above him; each had six wings: with two they covered their faces, and with two they covered their feet, and with two they flew.3And one called to another and said: “Holy, holy, holy is the Lord of hosts; the whole earth is full of his glory.”4The pivots on the thresholds shook at the voices of those who called, and the house filled with smoke.