Isaiah 6:2-4 World English Bible (WEB)
2 Above him stood the seraphim. Each one had six wings. With two he covered his face. With two he covered his feet. With two he flew. 3 One called to another, and said,
“Holy, holy, holy, is Yahweh of Armies!
4 The foundations of the thresholds shook at the voice of him who called, and the house was filled with smoke.