Isaiah 6:2-4 New King James Version (NKJV)
2 Above it stood seraphim; each one had six wings: with two he covered his face, with two he covered his feet, and with two he flew. 3 And one cried to another and said:
“Holy, holy, holy is the Lord of hosts;
4 And the posts of the door were shaken by the voice of him who cried out, and the house was filled with smoke.
Isaiah 6:2-4 New International Version (NIV)
2 Above him were seraphim, each with six wings: With two wings they covered their faces, with two they covered their feet, and with two they were flying. 3 And they were calling to one another:
“Holy, holy, holy is the Lord Almighty;
4 At the sound of their voices the doorposts and thresholds shook and the temple was filled with smoke.