Isaiah 6:2-4 New English Translation (NET Bible)
2 Seraphs[a] stood over him; each one had six wings. With two wings they covered their faces, with two they covered their feet,[b] and they used the remaining two to fly. 3 They called out to one another, “Holy, holy, holy[c] is the Lord of Heaven’s Armies![d] His majestic splendor fills the entire earth!” 4 The sound of their voices shook the door frames,[e] and the temple 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.